1,2,4-Triazolo(3,4-a)phthalazine, 3-mercapto-6-phenyl- 1,2,4-Triazolo(3,4-a)phthalazine-3(2H)-thione, 6-phenyl- 3-Mercapto-6-phenyl-1,2,4-triazolo(3,4-a)phthalazine 87540-71-4 BRN 4493920