4-oxocyclohexa-2,5-diene-1-carboxylate <=> 4-hydroxybenzoate
4-oxocyclohexa-2,5-diene-1-carboxylate <=> 4-hydroxybenzoate
4-oxocyclohexa-2,5-diene-1-carboxylate <=> 4-hydroxybenzoate
4-oxocyclohexa-2,5-diene-1-carboxylate <=> 4-hydroxybenzoate