Compound as reactive (1)

1-carboxyvinyl carboxyphosphonate → carboxyphosphinopyruvate

Compound as product (1)

2-phosphono-formylglycerate → H₂O + 1-carboxyvinyl carboxyphosphonate

Reversible reaction (1)

1-carboxyvinyl carboxyphosphonate + H⁺ ↔ 3-(hydroxyphosphinoyl)pyruvate + CO₂