SEARCH Articles Figures Tables 2- Methyl-3-phenylpyrazine 2-Chloro-3 -methyl-5 -phenylpyrazine 2-Chloro-6-hydroxy-3-methyl-5-phenylpyrazine methylation 2-Chloro-6-hydroxy-3-methyl-5-phenylpyrazine methylation 2-Hydroxy-3-phenylpyrazine 2-Phenylpyrazine 3- Hydroxy-5-methyl-2-phenylpyrazine 3- chloro-2-hydroxy 3-chloro-2-methyl Chloro methylation