Journal of Organic Chemistry, 42(1977), pp 1523–1527
Pteridines. 40. Some reactions of 2-amino-3-cyano-5-bromomethylpyrazine and 2-amino-3-cyano-5-methylpyrazine
Edward C. Taylor, John L. LaMattina
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http://dx.doi.org/10.1021/jo00429a009