Compound as reactive (1)

2-amino-4-carboxypyrimidine + H⁺ + L-serine → H₂O + lathyrine + CO₂

Compound as product (1)

2-hydroxy-4-carboxypyrimidine → 2-amino-4-carboxypyrimidine

Reversible reaction (1)

2-amino-4-carboxypyrimidine + L-alanine ↔ H₂O + lathyrine + CO₂