1,2,4-Triazolo(3,4-a)phthalazine, 3-(3,5-dibromo-2-ethoxyphenyl)-6-ethoxy- 3-(3,5-Dibromo-2-ethoxyphenyl)-6-ethoxy-1,2,4-triazolo(3,4-a)phthalazine 87540-53-2