Compound as reactive (1)
H
+
+
(
S
)-2-oxo-4-hydroxy-4-carboxy-5-ureidoimidazoline
→ CO
2
+ (
S
)-(+)-allantoin
Compound as product (1)
H
2
O + (
S
)-5-hydroxyisourate → H
+
+
(
S
)-2-oxo-4-hydroxy-4-carboxy-5-ureidoimidazoline
Reversible reaction (1)
(S)-2-oxo-4-hydroxy-4-carboxy-5-ureidoimidazoline
↔ allantoin + CO2