1,2,4-Triazolidine, 3,5-diimino- 1455-77-2 1H-1,2,4-Triazole-3,5-diamine 3,5-Diamino-1,2,4-Triazole 3,5-Diamino-1H-1,2,4-triazole 3,5-Diamino-s-triazole GUANAZOLE MC 51762 NSC 1895 NSC1895