3-(2-(3-((4-Methylphenyl)thio)-1-butenyl)hydrazino)-5,6-diphenyl-2,5-dihydro-1,2,4-triazine 3-(2-(5,6-Diphenyl-2,5-dihydro-1,2,4-triazin-3-yl)hydrazino)-1-methyl-2-propenyl 4-methylphenyl sulfide AIDS-137088 AIDS137088 NSC640640