an oxidized electron donor

a reduced electron donor

a deaminated amino group acceptor

an aminated amino group acceptor

Charged-LEU-tRNAs

LEU-tRNAs

a 2-oxo acid

an amino acid

an acyl-CoA

a carboxylate

an oxidized ferredoxin [iron-sulfur] cluster

a reduced ferredoxin [iron-sulfur] cluster

NAD(P)H

NAD(P)+

an L-tyrosyl-[tRNAtyr]

a tRNAtyr

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

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

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

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

isoshowacene

2-hydroxyhexadecanal

16-sinapoyloxypalmitate

3-methylquinolin-2-ol

(22R)-hydroxycholesterol

N-(2-methylpropyl)hydroxylamine

chloroeremomycin

3-hydroxy-3-methylbutanoate

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

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

2'-O-methyl-rhamnosyl tetracyclic spinosyn pseudoaglycone

rhamnosyl tetracyclic spinosyn pseudoaglycone

rhamnosyl tricyclic spinosyn pseudoaglycone

spinosyn tricyclic macrolactone

11-dehydro-15-oxo spinosyn macrolactone

15-oxo spinosyn macrolactone

spinosyn macrolactone

diethylamine N-oxide

triethylamine N-oxide

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

nitroxyl

trans,octacis-decaprenylphospho-β-D-arabinofuranose

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

2-phenylethyl β-D-glucopyranoside

formyl hopane

ribosyl hopane

adenosyl hopane

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

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

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

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

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

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

(+)-3'-hydroxylarreatricin

(+)-larreatricin

2-trans,4-trans-xanthoxin

ammonia

4-amino-2-methyl-5-(diphosphooxymethyl)pyrimidine

autoinducer 2

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

2-iminoacetate

5-amino-6-(5-phospho-D-ribosylamino)uracil

5-amino-6-(5-phospho-D-ribitylamino)uracil

2-amino-3-carboxymuconate-6-semialdehyde

N-acetyl-D-muramate 6-phosphate

(S)-5-amino-3-oxohexanoate

(3S,5S)-3,5-diaminohexanoate

acetoacetate

hydroxypyruvate

S-adenosyl 3-(methylsulfanyl)propylamine

(2S)-2-isopropyl-3-oxosuccinate

3-ethylmalate

2-oxovalerate

(R)-2,3-dihydroxy-3-methylpentanoate

(S)-2-acetolactate

(S)-2-aceto-2-hydroxybutanoate

pyrazine-2-carboxylate

creatinine

2-oleoylglycerol

3-dehydroquinate

shikimate

3-dehydroshikimate

shikimate 3-phosphate

5-enolpyruvoyl-shikimate 3-phosphate

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

(S)-dihydroorotate

orotidine 5'-phosphate

3-phosphooxypyruvate

(S)-ureidoglycolate

urea

γ-L-glutamyl 5-phosphate

(2S)-2-isopropylmalate

(2R,3S)-3-isopropylmalate

2-isopropylmaleate

citrate

prephenate

4-amino-4-deoxychorismate

anthranilate

N-(5-phosphoribosyl)-anthranilate

isochorismate

(2S,3S)-2,3-dihydroxy-2,3-dihydrobenzoate

L-β-lysine

4-imidazolone-5-propanoate

urocanate

2-dehydro-3-deoxy-D-gluconate

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

4-(β-D-ribofuranosyl)aminobenzene-5'-phosphate

methylsalicylate

muconolactone

(+)-muconolactone

cis,cis-muconate

quinolinate

1-deoxy-L-glycero-tetrulose 4-phosphate

2,5-diamino-6-(5-phospho-D-ribosylamino)pyrimidin-4(3H)-one

5-amino-6-(D-ribitylamino)uracil

4-methylumbelliferyl glucoside

4-hydroxybenzaldehyde

scopolin

cis-coumarinic acid-β-D-glucoside

β-nicotinate D-ribonucleotide

β-D-ribosylnicotinate

α-D-glucosamine 1-phosphate

ethanolamine

2-dehydropantoate

xanthine

butanoyl phosphate

DNA without lesion

prenyl diphosphate

H₂

1,4-dihydroxy-2-naphthoate

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

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

isopentenyl diphosphate

enol-phenylpyruvate

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

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

pyruvic oxime

N-acetyl-L-glutamate 5-semialdehyde

N-acetylglutamyl-phosphate

L-canavanine

L-arginino-succinate

canavaninosuccinate

salicyl alcohol

nicotinate adenine dinucleotide

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

N¹-(5-phospho-β-D-ribosyl)glycinamide

5-phospho-β-D-ribosylamine

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

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

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

thiamine phosphate

2-O-(6-phospho-α-D-mannosyl)-D-glycerate

3-keto-β-D-galactose

hydroxylamine

6-phospho D-glucono-1,5-lactone

D-gluconate 6-phosphate

oxalosuccinate

acetyl phosphate

S-methyl-5'-thioadenosine

5-(methylsulfanyl)-α-D-ribose

S-ribosyl-L-homocysteine

carbamoyl phosphate

O-ureido-L-homoserine

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

glycerone phosphate

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

luteolin 7-O-β-D-diglucuronide

luteolin 7-O-β-D-glucuronide

histidinal

imidazole acetol-phosphate

D-erythro-imidazole-glycerol-phosphate

dihydroxyacetone

N²-succinyl-L-glutamate 5-semialdehyde

N²-succinylglutamate

4-acetamidobutanal

4-acetamidobutanoate

2-keto-D-gluconate

2,5-didehydro-D-gluconate

S-methyl-5-thio-α-D-ribose 1-phosphate

5-(methylsulfanyl)-ribulose 1-phosphate

hydrogenobyrinate

hydrogenobyrinate a,c-diamide

(E)-4-hydroxy-3-methylbut-2-en-1-yl diphosphate

2-C-methyl-D-erythritol-2,4-cyclodiphosphate

2-C-methyl-D-erythritol 4-phosphate

thiamine diphosphate

(R)-pantothenate

(R)-4'-phosphopantothenate

oxaloacetate

phosphoenolpyruvate

(S)-3-methyl-2-oxopentanoate

4-methyl-2-oxopentanoate

3-methyl-2-oxobutanoate

N-acetyl-D-galactosamine 6-phosphate

D-galactosamine-6-phosphate

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

1,6-anhydro-N-acetyl-β-muramate

L-histidinol phosphate

histidinol

coproporphyrinogen III

nigerose

4'-phosphopantetheine

CO₂

hydrogen selenide

O-acetyl-L-serine

H₂O

hydrogen peroxide

(2E,6E)-farnesyl diphosphate

DNA with lesion

ethylphosphate

adenosylcobalamin

cob(I)alamin

cobalt-factor III

cobalt-precorrin-3

cobalt-sirohydrochlorin

cobalt-precorrin-7

cobalt-precorrin-8

cobalt-precorrin-6B

cobalt-precorrin-5B

cobalt-precorrin-6A

cobalt-precorrin-4

cobalt-precorrin-5A

chlorophyllide a

protochlorophyllide a

Mg-protoporphyrin

cob(I)yrinate a,c-diamide

adenosyl-cob(III)yrinate a,c-diamide

cob(I)inamide

adenosylcobinamide

3,8-divinyl protochlorophyllide a

13¹-oxo-magnesium-protoporphyrin IX 13-monomethyl ester

magnesium-protoporphyrin IX 13-monomethyl ester

13¹-hydroxy-magnesium-protoporphyrin IX 13-monomethyl ester

cob(II)yrinate c-monoamide

cob(II)yrinate a,c-diamide

cobyrinate

protoheme

hydrogen cyanide

protoporphyrin IX

uroporphyrinogen-III

protoporphyrinogen IX

oxygen

hydrogen sulfide

sn-glycerol 1-phosphate

sn-glycerol 3-phosphate

2,3-diphospho-D-glycerate

(R)-glycerate

3-phospho-D-glyceroyl-phosphate

2-phospho-D-glycerate

3-phospho-D-glycerate

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

(2R)-2,3-dihydroxy-3-methylbutanoate

α-D-glucosamine 6-phosphate

1-oleoyl-2-lyso-glycerone phosphate

5,10-methenyltetrahydrofolate mono-L-glutamate

nitric oxide

dimethyl sulfide

methanethiol

2-(2-carboxy-4-methylthiazol-5-yl)ethyl phosphate

L-cysteate

3-sulfopyruvate

(2R)-3-sulfolactate

(2R)-phospho-3-sulfolactate

trimethyl sulfonium

thiosulfate

nitrate

hydrogencarbonate

phosphate

triphosphate

diphosphate

Fe³⁺

ammonium

H⁺

Mg²⁺

Fe²⁺

Co²⁺

glycine betaine

betaine aldehyde

2-aminoprop-2-enoate

(2Z)-2-aminobut-2-enoate

2-iminopropanoate

spermine

spermidine

putrescine

2-amino-5-formylamino-6-(5-phospho-D-ribosylamino)pyrimidin-4(3H)-one

glycerophosphoglycerol

glycerophosphoserine

sn-glycero-3-phosphoethanolamine

fluoroacetaldehyde

fluoroacetate

5'-deoxy-5'-fluoroadenosine

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

5-chloro-5-deoxy-D-ribonate

5-chloro-4-hydroxy-2-oxopentanoate

5'-chloro-5'-deoxyadenosine

5-chloro-5-deoxyribose 1-phosphate

pyrazinamide

5-amino-4-imidazolecarboxyamide

1-(5-phospho-β-D-ribosyl)-5-[(5-phosphoribosylamino)methylideneamino]imidazole-4-carboxamide

phosphoribulosylformimino-AICAR-phosphate

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

nicotinamide

methyl (indol-3-yl)acetate

(indol-3-yl)acetate

(S)-3-aminobutanoyl-CoA

(11Z,14Z,17Z)-3-oxoicosatrienoyl-CoA

(3R,11Z,14Z,17Z)-3-hydroxyicosatrienoyl-CoA

isobutanoyl-CoA

succinyl-CoA

3'-dephospho-CoA

malonyl-CoA

acetyl-CoA

(S)-methylmalonyl-CoA

(R)-methylmalonyl-CoA

crotonyl-CoA

(S)-malyl-CoA

oleoyl-CoA

cerotoyl-CoA

2-carboxy-cerotoyl-CoA

butanoyl-CoA

propanoyl-CoA

hexadecanedioyl-CoA

acetoacetyl-CoA

all-trans-retinyl palmitate

D-glucono-1,5-lactone

FMNH₂

FMN

FAD

(S)-NADHX

(R)-NADHX

NADPH

NADH

NADP⁺

NAD⁺

ubiquinol-8

menaquinol-7

menaquinol-8

demethylmenaquinol-7

demethylmenaquinol-8

3-demethylubiquinol-8

coenzyme A

tetrahydropteroyl tri-L-glutamate

5,6,7,8-tetrahydrofolate

5,10-methylenetetrahydropteroyl mono-L-glutamate

10-formyl-tetrahydrofolate mono-L-glutamate

5-methyltetrahydropteroyl mono-L-glutamate

5-methyltetrahydropteroyl tri-L-glutamate

(6S)-5-formyl-tetrahydrofolate mono-L-glutamate

7,8-dihydrofolate monoglutamate

nicotinate

thiamine

riboflavin

pyridoxal 5'-phosphate

menadione

all-trans-retinol

(S)-1-pyrroline-5-carboxylate

precorrin-1

precorrin-2

sirohydrochlorin

6,7-dimethyl-8-(1-D-ribityl)lumazine

reduced riboflavin

7,8-dihydroneopterin 3'-phosphate

7,8-dihydroneopterin

6-(hydroxymethyl)-7,8-dihydropterin

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

7,8-dihydropterin-6-ylmethyl-4-(β-D-ribofuranosyl)aminobenzene 5'-phosphate

7,8-dihydroneopterin 3'-triphosphate

7,8-dihydroneopterin 2',3'-cyclic phosphate

7,8-dihydropteroate

guanine

adenine

2'-deoxyadenosine

2'-deoxyguanosine

2'-deoxyinosine

inosine

guanosine

xanthosine

adenosine

hypoxanthine

dATP

dGTP

dADP

dGDP

GDP

ADP

GMP

XMP

IMP

AMP

GTP

ATP

dCTP

dUDP

dUTP

dUMP

orotate

CDP

dCMP

dCDP

dTMP

dTDP

dTTP

UTP

UDP

uracil

CTP

UDP-α-D-galactofuranose

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

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

UDP-N-acetyl-α-D-muramoyl-L-alanine

UDP-N-acetyl-α-D-muramate

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

UDP-N-acetyl-α-D-mannosamine

UDP-α-D-galactose

UDP-α-D-glucose

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

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

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

UDP-N-acetyl-α-D-mannosaminuronate

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

UDP-N-acetyl-α-D-glucosamine

dTDP-β-L-rhamnose

dTDP-4-dehydro-β-L-rhamnose

dTDP-α-D-glucose

4-(cytidine 5'-diphospho)-2-C-methyl-D-erythritol

2-phospho-4-(cytidine 5'-diphospho)-2-C-methyl-D-erythritol

uridine

cytidine

thymidine

2'-deoxycytidine

2'-deoxyuridine

thymine

CMP

UMP

preQ₁

luteolin

scopoletin

coumarin

4-methylumbelliferone

taxiphyllin

linustatin

neolinustatin

linamarin

lotaustralin

preQ₀

2-hydroxy-2-methylpropanenitrile

(2R)-2-hydroxy-2-methylbutanenitrile

salicylaldehyde

urate

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

6-hydroxy-2-cyclohexen-one-carboxylate

benzaldehyde

indole

(1S,2R)-1-C-(indol-3-yl)glycerol 3-phosphate

hydroquinone

menadiol

4-methylphenol

2,3-dihydroxybenzoate

protocatechuate

coumarinate

salicylate

4-aminobenzoate

benzoate

L-serine

creatine

β-alanine

L-proline

L-alanine

L-leucine

L-glutamine

glycine

D-glutamate

L-glutamate

L-lysine

L-histidine

N^ω-hydroxy-L-arginine

L-arginine

L-aspartate

L-cysteine

L-tyrosine

L-threonine

L-tryptophan

L-phenylalanine

D-cysteine

D-alanine

L-aspartyl-4-phosphate

sarcosine

N-acetyl-L-ornithine

N-acetyl-L-glutamate

N-acetyl-L-methionine

N-carbamoyl-L-aspartate

O-acetyl-L-homoserine

3-phospho-L-serine

L-citrulline

L-isoleucine

L-valine

L-glutamate-5-semialdehyde

L-aspartate 4-semialdehyde

O-phospho-L-homoserine

L-ornithine

L-canaline

L-homoserine

O-succinyl-L-homoserine

S-adenosyl-L-methionine

S-adenosyl-L-homocysteine

S-sulfo-L-cysteine

L-homocysteine

meso-diaminopimelate

L-selenocysteine

L-allo-threonine

L-methionine

L,L-diaminopimelate

L-cystathionine

chorismate

(4S)-4-hydroxy-2-oxoglutarate

succinate

fumarate

(S)-malate

cis-aconitate

D-threo-isocitrate

(R)-lactate

(S)-lactate

pyruvate

acetate

formate

propanoate

butanoate

octanoate

apo-4'-lycopenoate

palmitate

D-gluconate

D-mannonate

(R)-pantoate

D-tagaturonate

β-D-glucuronate

aldehydo-D-galacturonate

3-(4-hydroxyphenyl)pyruvate

3-phenyl-2-oxopropanoate

glyoxylate

2-oxobutanoate

2-oxoglutarate

a methyl group

methylglyoxal

diacetyl

glycolaldehyde

butan-1-al

formaldehyde

1-octanal

acetaldehyde

(S)-lactaldehyde

L-glyceraldehyde

D-glyceraldehyde

α-D-glucopyranose

β-D-glucopyranose

β-D-ribopyranose

β-D-galactopyranose

α-D-galactopyranose

α-D-xylopyranose

aldehydo-D-ribose

α-D-ribofuranose

β-D-ribofuranose

butan-1-ol

ethanol

methanol

glycerol

galactitol

myo-inositol

galactinol

D-galactosylononitol

D-ononitol

phytate

D-myo-inositol (1,2,3,5,6) pentakisphosphate

1D-myo-inositol 3-monophosphate

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

1-oleoyl-sn-glycerol 3-phosphate

dioleoyl phosphatidate

trans,octacis-decaprenyl phosphate

di-trans,octa-cis-undecaprenyl phosphate

geranyl diphosphate

all-trans-octaprenyl diphosphate

geranylgeranyl diphosphate

all-trans-heptaprenyl diphosphate

mono-trans,octa-cis-decaprenyl diphosphate

di-trans,octa-cis-undecaprenyl diphosphate

apo-4'-lycopenal

1-(β-D ribofuranosyl)nicotinamide

isoprimeverose

XXLG xyloglucan oligosaccharide

XLXG xyloglucan oligosaccharide

XLLG xyloglucan oligosaccharide

XXXG xyloglucan oligosaccharide

raffinose

maltotriose

stachyose

maltotetraose

maltopentaose

maltoheptaose

maltohexaose

α-maltose

allolactose

melibiose

sucrose

α-lactose

β-D-cellobiose

keto-D-fructose

N-acetyl-α-D-glucosamine 1-phosphate

N-acetyl-α-D-mannosamine

N-acetyl-β-D-glucosamine

α-L-fucopyranose

β-L-fucopyranose

β-D-fructofuranose

L-fuculose

D-xylulose

L-ribulose

decaprenyl-diphospho-N-acetylmuramoyl-pentapeptide

3'-ketolactose

decaprenyl-pyrophosphoryl-(N-acetylglucosamine)-N-acetylmuramyl-(pentapeptide)

a peptidoglycan dimer (mycobacteria)

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

a peptidoglycan with D,D cross-links (mycobacteria)

a peptidoglycan with L,D cross-links (mycobacteria)

a peptidoglycan dimer (meso-diaminopimelate containing)

a peptidoglycan with D,D cross-links (meso-diaminopimelate containing)

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

ditrans,octacis-undecaprenyldiphospho-N-acetyl-(N-acetyl-β-D-glucosaminyl)muramoyl-L-alanyl-γ-D-glutamyl-L-lysyl-D-alanyl-D-alanine

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

D-ribulose-1,5-bisphosphate

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

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

N,N'-diacetylchitobiose 6'-phosphate

sucrose 6^G-phosphate

N-monoacetylchitobiose 6'-phosphate

sucrose 6^F-phosphate

β-D-cellobiose 6'-phosphate

ADP-α-D-glucose

GDP-α-D-glucose

GDP-α-D-mannose

D-glyceraldehyde 3-phosphate

α-D-glucopyranose 1-phosphate

1-(o-carboxyphenylamino)-1'-deoxyribulose 5'-phosphate

D-sedoheptulose 7-phosphate

D-erythrose 4-phosphate

5-phospho-α-D-ribose 1-diphosphate

β-D-fructose 1,6-bisphosphate

arbutin-6-phosphate

salicin 6-phosphate

D-fructose 6-phosphate

β-D-fructofuranose 6-phosphate

β-D-mannopyranose 6-phosphate

α-D-mannopyranose 6-phosphate

α-D-glucose 6-phosphate

β-D-glucose 6-phosphate

D-xylulose 5-phosphate

1-deoxy-D-xylulose 5-phosphate

L-ribulose 5-phosphate

D-ribulose 5-phosphate

aldehydo-D-ribose 5-phosphate

β-D-ribose 5-phosphate

α-D-ribose 5-phosphate

α-D-ribose-1-phosphate

2-deoxy-α-D-ribose 1-phosphate

L-fuculose 1-phosphate

L-rhamnulose 1-phosphate

α-D-galactose 1-phosphate

β-D-glucopyranose 1-phosphate

β-D-fructofuranose 1-phosphate

α-D-mannose 1-phosphate

methyl β-D-glucoside 6-phosphate

D-altronate

1-(5-phospho-β-D-ribosyl)-AMP

ppGpp

adenylo-succinate

1-(5-phospho-β-D-ribosyl)-ATP

5'-deoxyadenosine

pppGpp

β-nicotinamide D-ribonucleotide

reduced β-nicotinamide D-ribonucleotide

2-sulfanyl-N⁶-dimethylallyladenosine³⁷ in tRNA

2-methylsulfanyl-N⁶-dimethylallyladenosine³⁷ in tRNA

cyclic di-3',5'-guanylate

2-iminobutanoate

2-iminosuccinate

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

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

N-acetyl-L-glutaminyl-L-glutamine

N-acetyl-L-glutaminyl-L-glutamine amide

D-alanyl-D-alanine