SEARCH Articles Figures Tables 2- -2-hydroxy-5-methoxy pyrazine 2- Chloro-6-hydroxy pyrazine 2- Chloro-6-hydroxy pyrazine chlorination 2- Hydroxy-3- pyrazine oxidation 2-Hydroxy-3- pyrazine methylation 2-Hydroxy-3- pyrazines methylation 2-Hydroxy-6-methoxy pyrazine methylation 3- Carboxy-2-hydroxy pyrazine 3-Hydroxy-2-isobutyl-5- pyrazine 5-Hydroxy-3-methyl-2- pyrazine 5-Hydroxy-3-methyl-2- pyrazine reduction Amino hydroxy pyrazines, chlorination From Hydroxy pyrazines Pyrazine hydroxy Pyrazine hydroxy Pyrido pyrazine-7-carboxylates 8-hydroxy