Compound as reactive (3)

(1Z,3Z)-4-hydroxybuta-1,3-diene-1,2,4-tricarboxylate → (2Z)-4-oxobut-2-ene-1,2,4-tricarboxylate

2 H⁺ + (1Z,3Z)-4-hydroxybuta-1,3-diene-1,2,4-tricarboxylate → (1E)-4-oxobut-1-ene-1,2,4-tricarboxylate

(1Z,3Z)-4-hydroxybuta-1,3-diene-1,2,4-tricarboxylate → (1E,3E)-4-hydroxybuta-1,3-diene-1,2,4-tricarboxylate

Compound as product (2)

H₂O + 4-carboxy-2-hydroxy-6-methoxy-6-oxohexa-2,4-dienoate → (1Z,3Z)-4-hydroxybuta-1,3-diene-1,2,4-tricarboxylate + methanol + H⁺

H₂O + 2-pyrone-4,6-dicarboxylate → (1Z,3Z)-4-hydroxybuta-1,3-diene-1,2,4-tricarboxylate + H⁺

Reversible reaction (1)

gallate + oxygen ↔ 2 H⁺ + (1Z,3Z)-4-hydroxybuta-1,3-diene-1,2,4-tricarboxylate