... <:>■ NH( CH3 I o=c i 4N=C ! c=o ! NH (I) *1 Presented at the 15th Annual Meeting of the Chemical Society of Japan, Kyoto, April, 1962. ... Pat., 736034 (1955) ; E. Koike and Y. Yagi, Japanese Pat. Announced No. 36-8730. 2) Part I, This Bulletin, 36, 487 (1963). ...