Compound as reactive (1)

1,4-benzoquinone + L-cysteine → 2-amino-3-[(2,5-dihydroxyphenyl)sulfanyl]propanoate

Compound as product (2)

2 hydroquinone + oxygen → 2 H₂O + 2 1,4-benzoquinone

4-nitrophenol + NAD(P)H + H⁺ + oxygen → H₂O + 1,4-benzoquinone + NAD(P)+ + nitrite

Reversible reaction (2)

hydrogen peroxide + hydroquinone ↔ 2 H₂O + 1,4-benzoquinone

1,4-benzoquinone + NADPH + H⁺ ↔ hydroquinone + NADP⁺