1,1'-(Methylethanedilidenedinitrilo)biguanidine dihydrochloride dihydrate 31959-87-2 Guanidine, 1,1'-((methylethanediylidene)dinitrilo)bis-, dihydrochloride, dihydrate Hydrazinecarboximidamide, 2,2'-(1-methyl-1.2-ethanediylidene)bis-, dihydrochloride, dihydrate NSC 32946