1,2,4-Triazolo(3,4-a)phthalazine, 6-ethoxy-3-phenyl- 3-Phenyl-6-ethoxy-1,2,4-triazolo(3,4-a)phthalazine 6-Ethoxy-3-phenyl-1,2,4-triazolo(3,4-a)phthalazine 87540-40-7