87540-59-8 Butanoic acid, 4-((3-(4-methoxyphenyl)-1,2,4-triazolo(3,4-a)phthalazin-6-yl)oxy)-, ethyl ester Ethyl 4-((3-(4-methoxyphenyl)-1,2,4-triazolo(3,4-a)phthalazin-6-yl)oxy)butanoate