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2-Methyl pyrazine
2,3-Dimethyl pyrazine
2,5(or6)-Dimethyl pyrazine
2,6-Dimethyl pyrazine
2,3,5-Trimethyl pyrazine
2,3,5,6-Tetramethyl pyrazine
5,6,7,8-Tetrahydro quinoxaline
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