1H-(1,2,4)Triazolo(1,2-a)pyridazine-1,3(2H)-dione, tetrahydro-2-(3-chlorophenyl)- 2-(3-Chlorophenyl)-1H-tetrahydro(1,2,4)triazolo(1,2-a)pyridazine-1,3(2H)-dione 58744-04-0