ID Name References
C1

an oxidized electron donor

C2

a reduced electron donor

C3

a deaminated amino group acceptor

C4

an aminated amino group acceptor

C5

Charged-LEU-tRNAs

C6

LEU-tRNAs

C7

a 2-oxo acid

C8

an amino acid

C9

an acyl-CoA

C10

a carboxylate

C11

an oxidized ferredoxin [iron-sulfur] cluster

C12

a reduced ferredoxin [iron-sulfur] cluster

C13

NAD(P)H

C14

NAD(P)+

C15

an L-tyrosyl-[tRNAtyr]

C16

a tRNAtyr

C17

(2Z,4Z)-2-hydroxy-5-carboxymuconate-6-semialdehyde

C18

4α,14α-dimethyl-porifersta-8,25(27)-dienol

C24

2-amino-4,5-dihydroxy-6-oxo-7-(phosphooxy)heptanoate

C26

4-methylcyclohex-1,5-diene-1-carbonyl-CoA

C27

isoshowacene

C29

2-hydroxyhexadecanal

C30

16-sinapoyloxypalmitate

C31

3-methylquinolin-2-ol

C32

(22R)-hydroxycholesterol

C37

N-(2-methylpropyl)hydroxylamine

C38

chloroeremomycin

C39

3-hydroxy-3-methylbutanoate

C40

2',3',4'-O-methyl-rhamnosyl tetracyclic spinosyn pseudoaglycone

C41

2',3'-O-methyl-rhamnosyl tetracyclic spinosyn pseudoaglycone

C42

2'-O-methyl-rhamnosyl tetracyclic spinosyn pseudoaglycone

C43

rhamnosyl tetracyclic spinosyn pseudoaglycone

C44

rhamnosyl tricyclic spinosyn pseudoaglycone

C45

spinosyn tricyclic macrolactone

C46

11-dehydro-15-oxo spinosyn macrolactone

C47

15-oxo spinosyn macrolactone

C48

spinosyn macrolactone

C51

diethylamine N-oxide

C52

triethylamine N-oxide

C53

UDP-2-acetamido-2-deoxy-α-D-ribo-hex-3-uluronate

C55

nitroxyl

C57

trans,octacis-decaprenylphospho-β-D-arabinofuranose

C58

1,3-dihydro-2H-imidazol-2-one

C63

2-phenylethyl β-D-glucopyranoside

C64

formyl hopane

C65

ribosyl hopane

C66

adenosyl hopane

C70

(2Z)-2-hydroxypenta-2,4-dienoate

C72

(2S,4S)-4-hydroxy-2,3,4,5-tetrahydrodipicolinate

C73

(2Z)-2,4-dihydroxypent-2-enoate

C75

(2E,7Z,10Z,13Z,16Z,19Z)-docosahexaenoyl-CoA

C76

(3R,5Z,8Z,11Z,14Z,17Z)-3-hydroxydocosapentaenoyl-CoA

C77

(5Z,8Z,11Z,14Z,17Z)-3-oxodocosapentaenoyl-CoA

C79

(+)-3'-hydroxylarreatricin

C80

(+)-larreatricin

C81

2-trans,4-trans-xanthoxin

C582

(2S,4S)-2-methyl-2,3,3,4-tetrahydroxytetrahydrofuran

C1010

ammonia

C12274

enol-phenylpyruvate

C583

(2S,4S)-2-methyl-2,4-dihydroxydihydrofuran-3-one

C9431

1,2-dihydro-β-NADP

C1271

4-oxoglutaramate

C1553

2'-(5''-triphospho-α-D-ribosyl)-3'-dephospho-CoA

C1353

3-phosphooxypyruvate

C4674

glutathione disulfide

C3417

(S)-3-methyl-2-oxopentanoate

C12494

N-acetyl-D-muramate 6-phosphate

C3319

4-methyl-2-oxopentanoate

C3262

3-methyl-2-oxobutanoate

C585

(2R,4S)-2-methyl-2,4-dihydroxydihydrofuran-3-one

C584

(2R,4S)-2-methyl-2,3,3,4-tetrahydroxytetrahydrofuran

C11715

quinolinate

C11800

(R)-pantothenate

C11802

4'-phosphopantetheine

C1268

(R)-4'-phosphopantothenate

C11710

(R)-4'-phosphopantothenoyl-L-cysteine

C7865

urea

C12016

(lipoyl)adenylate

C232

(2Z,4E)-2-hydroxyhexa-2,4-dienedioate

C11539

xanthine

C13879

(R)-mevalonate diphosphate

C11964

(R)-mevalonate

C13985

(R)-5-phosphomevalonate

C1528

2-dehydropantoate

C3656

D-gluconate 6-phosphate

C14924

carboxyphosphate

C2191

carbamoyl phosphate

C2580

methylsalicylate

C14216

3-keto-L-gulonate 6-phosphate

C12192

carbonic acid

C1102

O-acetyl-L-serine

C11932

N-acetyl-D-galactosamine 6-phosphate

C15282

D-galactosamine-6-phosphate

C12369

3-dehydroquinate

C1431

3-dehydroshikimate

C11857

β-nicotinate D-ribonucleotide

C9422

nicotinate adenine dinucleotide

C12029

S-ribosyl-L-homocysteine

C12324

autoinducer 2

C6361

acetoacetate

C1208

5-dehydro-D-gluconate

C223

3-(4-deoxy-β-D-gluc-4-enuronosyl)-N-acetyl-D-glucosamine

C6444

oxaloacetate

C12325

1,4-dihydroxy-2-naphthoate

C11760

prephenate

C1555

(S)-2,3-dihydrodipicolinate

C1108

acetyl phosphate

C11737

(3R,5S)-3-hydroxy-1-pyrroline-5-carboxylate

C13635

β-D-ribosylnicotinate

C11604

thiamine diphosphate

C6614

O-ureido-L-homoserine

C1429

3-deoxy-D-arabino-heptulosonate 7-phosphate

C15056

salicyl alcohol

C10349

glycerone phosphate

C12056

L-arginino-succinate

C932

canavaninosuccinate

C933

L-canavanine

C1325

4-amino-4-deoxychorismate

C11754

propanoyl phosphate

C873

coproporphyrinogen III

C1171

2-(formamido)-N1-(5-phospho-β-D-ribosyl)acetamidine

C1182

N2-formyl-N1-(5-phospho-β-D-ribosyl)glycinamide

C1184

5-phospho-β-D-ribosylamine

C1180

N1-(5-phospho-β-D-ribosyl)glycinamide

C11774

5-amino-1-(5-phospho-D-ribosyl)imidazole-4-carboxylate

C1172

5-amino-1-(5-phospho-β-D-ribosyl)imidazole

C928

CO2

C11812

5'-phosphoribosyl-4-(N-succinocarboxamide)-5-aminoimidazole

C12230

formamide

C1285

4-imidazolone-5-propanoate

C11557

urocanate

C12364

isopentenyl diphosphate

C1590

4,4'-dihydroxy-3,3'-dimethoxystilbene

C3629

vanillin

C1552

2-(α-hydroxyethyl)thiamine diphosphate

C12218

α-D-glucosamine 1-phosphate

C12162

hydrogen peroxide

C12000

luteolin 7-O-[β-D-glucosyluronate-(1,2)-β-D-glucosiduronate]-4'-O-β-D-glucosiduronate

C12004

luteolin 7-O-β-D-diglucuronide

C12002

luteolin 7-O-β-D-glucuronide

C1503

2-dehydro-3-deoxy-D-gluconate 6-phosphate

C11832

orotidine 5'-phosphate

C12352

(S)-dihydroorotate

C3344

2-dehydro-3-deoxy-D-gluconate

C11483

glycolate

C13225

N-acetyl-β-D-glucosamine-1,6-anhydro-N-acetyl-β-D-muramate

C12492

1,6-anhydro-N-acetyl-β-muramate

C1427

5-enolpyruvoyl-shikimate 3-phosphate

C11653

shikimate

C11652

shikimate 3-phosphate

C13627

DNA without lesion

C15283

poly(ribitol phosphate)

C13813

O-D-alanyl-poly(ribitol phosphate)

C571

4-hydroxy-2-nonenal

C14074

prenyl diphosphate

C191

L-selenocystathionine

C11543

H2O

C3421

formate

C11479

phosphoenolpyruvate

C12048

γ-L-glutamyl 5-phosphate

C4632

(glutathion-S-yl)-4-hydroxy-2-nonenal

C10799

DNA with lesion

C12247

L-homocysteine

C803

ethylphosphate

C13422

hydrogen cyanide

C6624

protoheme

C7676

protoporphyrin IX

C7658

uroporphyrinogen-III

C7666

protoporphyrinogen IX

C7118

hydrogen sulfide

C7121

oxygen

C6596

2-iminosuccinate

C6708

2-iminopropanoate

C11281

2-chloroacetate

C8419

sn-glycerol 3-phosphate

C6437

3-phospho-D-glyceroyl-phosphate

C6425

2-phospho-D-glycerate

C6438

3-phospho-D-glycerate

C2151

dTDP-4-dehydro-6-deoxy-α-D-glucopyranose

C2017

α-D-glucosamine 6-phosphate

C6617

N-acetyl-D-mannosamine 6-phosphate

C6644

S-(4-hydroxy-nonenal-3-yl)-L-cysteinylglycine

C13354

preQ0

C13114

1-chloro-2,4-dinitrobenzene

C4658

2,4-dinitrophenyl-S-glutathione

C4960

N-acetyl-β-neuraminate

C7306

5'-deoxy-5'-fluoroadenosine

C7314

5-fluoro-5-deoxy-D-ribose 1-phosphate

C5546

5'-chloro-5'-deoxyadenosine

C11254

5-chloro-5-deoxyribose 1-phosphate

C7864

Fe3+

C4328

ammonium

C4320

H+

C11009

Mg2+

C11011

Cu2+

C11006

Co2+

C11005

Zn2+

C11021

Mn2+

C11023

Fe2+

C7034

hydrogensulfite

C7025

OH-

C7036

hydrogencarbonate

C7024

thiosulfate

C7016

sulfite

C8958

superoxide

C6762

phosphonate

C6097

phosphate

C6093

diphosphate

C7006

chloride

C8965

hydroxyl radical

C9077

(2E,6E)-farnesyl diphosphate

C4334

1-oleoyl-2-palmitoyl-phosphatidylglycerol

C2930

ferrichrome

C6524

2-aminoprop-2-enoate

C3574

spermidine

C3548

putrescine

C1476

γ-L-glutamyl-[(S)-allyl]-L-cysteine

C2490

S-allyl-L-cysteine

C1461

γ-L-glutamyl-(S)-methyl-L-cysteine

C1464

γ-L-glutamyl-(S)-trans-1-propenyl-L-cysteine

C4716

S-trans-1-propenyl-L-cysteine

C3978

thiocyanate

C4678

glutathione

C12587

L-cysteate

C12637

3-sulfopyruvate

C4580

(R)-S-lactoylglutathione

C3727

all-trans-retinyl palmitate

C5311

(S)-3-hydroxy-3-methylglutaryl-CoA

C4913

malonyl-CoA

C4901

succinyl-CoA

C5314

2-methylacetoacetyl-CoA

C5298

acetyl-CoA

C4937

3'-dephospho-CoA

C5635

oleoyl-CoA

C2008

acetoacetyl-CoA

C2009

3-oxopentanoyl-CoA

C5637

cis-vaccenoyl-CoA

C5651

palmitoleoyl-CoA

C5890

myristoyl-CoA

C1175

butanoyl-CoA

C1177

propanoyl-CoA

C11195

18-hydroxylinoleoyl-CoA

C491

18-hydroxyoleoyl-CoA

C10774

(3R)-3-hydroxybutanoyl-CoA

C6562

hexadecanedioyl-CoA

C1337

crotonyl-CoA

C9098

methyl (indol-3-yl)acetate

C9096

(indol-3-yl)acetate

C10988

riboflavin

C10982

nicotinate

C10994

thiamine

C10966

all-trans-retinol

C7134

tetrahydropteroyl tri-L-glutamate

C8566

5-methyltetrahydropteroyl tri-L-glutamate

C10597

7,8-dihydrofolate monoglutamate

C4216

pyridoxamine

C4188

pyridoxamine 5'-phosphate

C10049

FMNH2

C10052

FMN

C5394

(R)-NADHX

C5392

(S)-NADHX

C14500

NADH

C14497

NADPH

C4020

NAD+

C4018

NADP+

C1863

demethylmenaquinol-8

C11516

glycine betaine

C7649

isoguanine

C7647

8-oxo-dGTP

C7655

8-oxo-GTP

C7783

dATP

C7751

dGTP

C7811

XMP

C7785

hypoxanthine

C10267

pppGpp

C10266

ppGpp

C7652

cyclic-AMP

C7841

adenosine 2',3'-cyclic monophosphate

C7645

guanosine 2',3'-cyclic monophosphate

C7653

guanosine 3'-monophosphate

C7641

adenosine 3'-monophosphate

C7827

GMP

C7741

IMP

C5552

5'-deoxyadenosine

C10288

adenylo-succinate

C7747

dIDP

C7749

dITP

C7817

IDP

C7759

ITP

C7823

dADP

C7807

dGDP

C7813

2'-deoxyadenosine

C7848

2'-deoxyguanosine

C7755

2'-deoxyinosine

C7745

GTP

C7795

GDP

C7809

AMP

C7844

ATP

C7757

ADP

C15094

xanthosine

C15085

guanosine

C15091

inosine

C15088

adenosine

C2706

uridine

C2702

cytidine

C2523

2'-deoxycytidine

C2519

thymidine

C2527

2'-deoxyuridine

C8747

uridine 2'3'-cyclic monophosphate

C8750

cytidine 2',3'-cyclic monophosphate

C10284

2-hydroxy-dATP

C10290

5-hydroxy-CTP

C8724

dUTP

C8772

dCTP

C8764

dTTP

C8760

UTP

C8761

CTP

C8770

dUMP

C8744

dTMP

C8755

dCMP

C2241

UMP

C2245

CMP

C8720

dTDP

C8733

dCDP

C8752

dUDP

C8732

CDP

C8714

UDP

C4243

β-nicotinamide D-ribonucleotide

C6462

uridine 3'-monophosphate

C6460

cytidine-3'-monophosphate

C10263

ADP-α-D-glucose

C9540

preQ1

C10601

thymine

C8739

uracil

C9455

guanine

C9454

adenine

C7780

UDP-α-D-glucose

C1939

dTDP-α-D-glucose

C7822

UDP-N-acetyl-α-D-muramate

C7742

UDP-N-acetyl-α-D-muramoyl-L-alanine

C7808

UDP-N-acetyl-α-D-muramoyl-L-alanyl-D-glutamate

C7824

UDP-N-acetyl-α-D-muramoyl-L-alanyl-γ-D-glutamyl-L-lysine

C7734

UDP-N-acetyl-α-D-glucosamine-enolpyruvate

C5848

UDP-N-acetyl-α-D-muramoyl-L-alanyl-γ-D-glutamyl-L-lysyl-D-alanine

C5094

UDP-N-acetyl-α-D-muramoyl-L-alanyl-γ-D-glutamyl-meso-2,6-diaminopimeloyl-D-alanyl-D-alanine

C5090

UDP-N-acetyl-α-D-muramoyl-L-alanyl-γ-D-glutamyl-L-lysyl-D-alanyl-D-alanine

C5150

UDP-N-acetyl-α-D-muramoyl-L-alanyl-γ-D-glutamyl-meso-2,6-diaminopimelate

C7444

UDP-N-acetyl-α-D-glucosamine

C1930

dTDP-β-L-rhamnose

C1896

dTDP-4-dehydro-β-L-rhamnose

C10611

(R)-lipoate

C10614

coenzyme A

C4985

(S)-1-pyrroline-5-carboxylate

C15044

reduced riboflavin

C12708

7,8-dihydroneopterin 3'-phosphate

C12680

(7,8-dihydropterin-6-yl)methyl diphosphate

C12726

2-amino-6-[1-hydroxyethyl]-7-methyl-7,8-dihydropterin

C12676

[1-(2-amino-7-methyl-4-oxo-7,8-dihydro-3H-pteridin-6-yl)]ethyl diphosphate

C12664

7,8-dihydroneopterin

C12696

7,8-dihydromonapterin

C12728

6-(hydroxymethyl)-7,8-dihydropterin

C12730

7,8-dihydroneopterin 3'-triphosphate

C10609

7,8-dihydropteroate

C8741

dipicolinate

C11481

orotate

C4352

luteolin

C3093

urate

C6908

salicyl-6-hydroxy-2-cyclohexene-on-oyl

C7033

6-hydroxy-2-cyclohexen-one-carboxylate

C2903

hydroquinone

C11429

salicylate

C8974

4-aminobenzoate

C6090

methylglyoxal

C2858

glycolaldehyde

C3500

acetaldehyde

C6246

(S)-lactaldehyde

C9494

D-glyceraldehyde

C2065

aldehydo-D-ribose

C2062

β-D-ribofuranose

C2061

α-D-ribofuranose

C2063

β-D-ribopyranose

C3450

ethanol

C3448

methanol

C3731

glycerol

C10527

myo-inositol

C13576

1D-myo-inositol 1-monophosphate

C13573

1D-myo-inositol 3-monophosphate

C4086

1-(β-D ribofuranosyl)nicotinamide

C4068

5-dehydro-4-deoxy-D-glucuronate

C2021

aldehydo-D-galacturonate

C10688

maltotriose

C10689

maltotetraose

C10690

maltopentaose

C10692

maltoheptaose

C10691

maltohexaose

C9477

N-acetyl-α-D-muramoyl-L-alanine(1-)

C15288

N-acetylmuramate

C3186

N-acetyl-α-D-glucosamine 1-phosphate

C13570

N-acetyl-β-D-mannosamine

C5286

N-acetyl-β-D-glucosamine

C8835

β-D-fructofuranose

C3743

4-deoxy-L-threo-hex-4-enopyranuronate

C11625

1-O-acetyl-α-maltose

C11619

decaprenyl-diphospho-N-acetylmuramoyl-pentapeptide

C10362

undecaprenyl-diphospho-N-acetylmuramoyl-L-alanyl-γ-D-glutamyl-L-lysyl- D-alanine

C13226

a peptidoglycan dimer with pentapeptide stems (meso-diaminopimelate containing)

C13222

a peptidoglycan dimer with pentapeptide stem (meso-diaminopimelate containing)

C3120

ditrans,octacis-undecaprenyldiphospho-[(N-acetyl-β-D-glucosaminyl)-(1,4)-]-N-acetyl-α-D-muramoyl-L-alanyl-γ-D-glutamyl-meso-2,6-diaminopimeloyl-D-alanyl-D-alanine

C5529

GlcNAc-1,6-anhMurNAc-L-Ala-γ-D-Glu-DAP-D-Ala

C3138

undecaprenyl-diphospho-N-acetylmuramoyl-L-alanyl-γ-D-glutamyl-L-lysyl- D-alanyl-D-alanine

C3137

undecaprenyldiphospho-N-acetylmuramoyl-L-alanyl-γ-D-glutamyl-meso-2,6-diaminopimeloyl-D-alanyl-D-alanine

C6671

N,N'-diacetylchitobiose 6'-phosphate

C6669

N-monoacetylchitobiose 6'-phosphate

C8811

α-D-glucopyranose 1-phosphate

C5615

D-glyceraldehyde 3-phosphate

C10340

D-erythrose 4-phosphate

C15289

D-sedoheptulose 7-phosphate

C10338

5-phospho-α-D-ribose 1-diphosphate

C10324

D-tagatofuranose 1,6-bisphosphate

C10326

β-D-fructose 1,6-bisphosphate

C10331

salicin 6-phosphate

C10334

arbutin-6-phosphate

C10328

keto-L-tagatose 6-phosphate

C15303

D-fructose 6-phosphate

C10325

L-ascorbate 6-phosphate

C10323

D-tagatofuranose 6-phosphate

C2989

β-D-fructofuranose 6-phosphate

C2125

α-D-glucose 6-phosphate

C2123

β-D-glucose 6-phosphate

C8701

L-xylulose 5-phosphate

C8704

D-xylulose 5-phosphate

C6715

aldehydo-D-ribose 5-phosphate

C6709

β-D-ribose 5-phosphate

C6711

α-D-ribose 5-phosphate

C10607

L-ribulose 5-phosphate

C10604

D-ribulose 5-phosphate

C2057

α-D-ribose-1-phosphate

C2056

2-deoxy-α-D-ribose 1-phosphate

C8817

L-rhamnulose 1-phosphate

C2129

β-D-glucopyranose 1-phosphate

C2082

β-D-fructofuranose 1-phosphate

C8669

methyl β-D-glucoside 6-phosphate

C3675

D-altronate

C3676

L-idonate

C11485

D-gluconate

C11487

D-mannonate

C6241

1-oleoyl-sn-glycerol 3-phosphate

C10024

1-(18-hydroxyoleoyl)-sn-glycrol 3-phosphate

C6239

1-myristoyl-sn-glycerol 3-phosphate

C6240

1-palmitoyl-sn-glycerol 3-phosphate

C6242

1-cis-vaccenoyl-sn-glycerol-3-phosphate

C10025

1-C16:0-α,ω-dicarboxyl-2-lysophosphatidate

C3826

1-[18-hydroxyoeoyl]-2-[18-hydroxy-lioleoyl]-sn-glycerol 3-phosphate

C3816

1,2-dimyristoyl-sn-glycerol 3-phosphate

C3822

1-palmitoyl-2-myristoyl phosphatidate

C3117

dioleoyl phosphatidate

C3119

1,2-dicis-vaccenoyl-phosphatidate

C3512

1-cis-vaccenoyl-2-palmitoleoyl-sn-glycerol-3-phosphate

C3542

1-palmitoyl-2-cis-vaccenoyl phosphatidate

C3510

1-palmitoyl-2-palmitoleoyl-sn-glycerol 3-phosphate

C3514

1-myristoyl-2-palmitoleoyl-sn-glycerol 3-phosphate

C5904

phosphatidylglycerophosphate (1-octadecenoyl(9Z), 2-palmitoyl)

C8321

geranyl diphosphate

C9304

trans,octacis-decaprenyl phosphate

C8322

di-trans,octa-cis-undecaprenyl phosphate

C5382

all-trans-heptaprenyl diphosphate

C5383

all-trans-octaprenyl diphosphate

C5378

geranylgeranyl diphosphate

C4821

3-benzyl-3,6-dihydroxy-6-(hydroxymethyl)-diketopiperazine

C4819

3-benzyl-3,6 -bis(glutathione)- 6-(hydroxymethyl)-diketopiperazine

C8043

5-amino-1-(5-phospho-D-ribosyl)imidazole-4-carboxamide

C8033

5-amino-4-imidazolecarboxyamide

C3316

(3E)-2-oxohex-3-enedioate

C8950

chorismate

C6442

succinate

C5596

L-aspartate

C6443

fumarate

C3345

3-phenyl-2-oxopropanoate

C3301

2-oxoglutarate

C3308

pyruvate

C3418

butanoate

C11212

(R)-3-hydroxybutanoate

C6186

(S)-lactate

C6185

(R)-lactate

C3383

palmitate

C11482

(R)-pantoate

C11517

acetate

C2137

D-tagaturonate

C2045

β-D-glucuronate

C5032

carbamate

C5579

L-serine

C5612

L-cysteine

C5573

L-tyrosine

C5643

L-asparagine

C5609

L-glutamine

C12067

glycine

C5642

L-arginine

C5605

L-histidine

C5607

L-glutamate

C5583

L-methionine

C5588

L-leucine

C5571

L-valine

C5581

L-proline

C5603

L-isoleucine

C5597

L-alanine

C2469

L-phenylalanine

C11441

β-alanine

C8797

D-glutamate

C8799

D-alanine

C5601

L-isoglutamine

C12231

L-ornithine

C5580

L,L-diaminopimelate

C5595

L-cystathionine

C13322

N-carbamoyl-L-aspartate

C5476

formyl-L-isoglutamine

C5466

N-formimino-L-glutamate

C12063

seleno-L-homocysteine

C3402

3-phospho-L-serine

C6936

S-methyl-L-cysteine

C10821

trans-4-hydroxy-L-proline

C12303

L-citrulline

C12203

S-adenosyl-L-homocysteine

C12233

L-glutamate-5-semialdehyde

C12239

L-aspartate 4-semialdehyde

C12237

L-canaline

C15292

S-adenosyl-L-methionine

C5585

meso-diaminopimelate

C2488

S-(4-hydroxy-nonenal-3-yl)-L-cysteine

C2562

L-alanyl-γ-D-glutamyl-meso-2,6-diaminopimeloyl-D-alanine

C2576

L-alanyl-γ-D-glutamyl-meso-diaminopimelate

C1434

D-alanyl-D-alanine

C8518

γ-L-glutamyl-L-cysteine

C6530

L-alanyl-γ-D-glutamyl-meso-2,6-diaminopimeloyl-D-alanyl-D-alanine