1,1'-(Ethanediylidenedinitrilo)diguanidine diacetate 76430-81-4 Glyoxal bisguanylhydrazone diacetate Glyoxal-bis-guanylhydrazone diacetate Guanidine, 1,1'-(ethanediylidenedinitrilo)di-, diacetate Hydrazinecarboximidamide, 2,2'-(1,2-ethanediylidene)bis-, diacetate NSC 22182