SEARCH Articles Figures Tables 2- -2-hydroxy-5-methoxy pyrazine 2-Hydroxy-3- pyrazine methylation 2-Hydroxy-3- pyrazines 2-Hydroxy-3- pyrazines methylation 2-Methoxy-3- pyrazine 2-Methyl-3- pyrazine 2-methoxy-3-methyl pyrazine 5-Hydroxy-3-methoxy 5-Hydroxy-3-methyl-2- pyrazine 5-Methoxy-4-methyl Methoxy pyrazines Pyrazine hydroxy