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