77476-06-3 Hydrazinecarboximidamide, 2-[1-(9H-fluoren-2-yl)ethylidene[-N-methyl-, monohydrochloride Hydrazinecarboximidamide, 2-[1-(9H-fluoren-2-yl)ethylidene]-N-methyl-, monohydrochloride NSC298823