vanillate + formaldehyde + A + H2O => 3,4-dimethoxybenzoate + AH2 + O2
vanillate + formaldehyde + a + h2o => 3,4-dimethoxybenzoate + ah2 + o2
vanillate + formaldehyde + A + H2O => 3,4-dimethoxybenzoate + AH2 + O2
vanillate + formaldehyde + a + h2o => 3,4-dimethoxybenzoate + ah2 + o2