title: 6-Butyl-5-(4-methoxy-phen-oxy)-3-phenyl-3H-1,2,3-triazolo[4,5-d]pyrimidin-7(6H)-one.
abstract: The asymmetric unit of the title compound, C(21)H(21)N(5)O(3), consists of two geometrically similar mol-ecules. The fused rings of the triazolo[4,5-d]pyrimidine system are nearly coplanar, making dihedral angels of 1.48 (18) and 1.34 (16)°, and the phenyl rings are twisted by 12.3 (1) and 8.7 (1)° with respect to the triazolopyrimidine plane. The ethyl groups of the n-butyl side chains are disordered over two sites in each of the independent mol-ecules, the ratios of occupancies being 0.60:0.40 and 0.61:0.39.
authors.forename: Xiao-Hua
authors.initials: XH
authors.lastname: Zeng
authors.forename: Shou-Heng
authors.initials: SH
authors.lastname: Deng
authors.forename: Ping
authors.initials: P
authors.lastname: Chen
authors.forename: Hong-Mei
authors.initials: HM
authors.lastname: Wang
authors.forename: Zuan
authors.initials: Z
authors.lastname: Ma