Chemistry of hydrocyanic acid. 1. Formation and reactions of N-(aminomethylene)diaminomaleonitrile, a hydrocyanic acid pentamer and precursor to adenine
Richard F. Shuman, Willard E. Shearin, Roger J. Tull
J. Org. Chem., 1979, 44 (25), pp 4532–4536
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http://dx.doi.org/10.1021/jo00393a016