3-(2-(3-((4-Chlorophenyl)thio)-3-phenyl-1-propenyl)hydrazino)-5,6-diphenyl-2,5-dihydro-1,2,4-triazine 4-Chlorophenyl 3-(2-(5,6-diphenyl-2,5-dihydro-1,2,4-triazin-3-yl)hydrazino)-1-phenyl-2-propenyl sulfide AIDS-137083 AIDS137083 NSC640631