title: 1-Eth-oxy-methyl-5-methyl-9-phenyl-6,7,8,9-tetra-hydro-1H-pyrimido[4,5-b][1,4]diazepine-2,4(3H,5H)-dione.
abstract: The title compound, C(17)H(22)N(4)O(3), comprises a 1,4-diazepine ring in a twist-boat conformation fused to a pyrimidine ring. The dihedral angle between the pyrimidine and phenyl rings is 80.8 (1)°. The crystal packing features N-H⋯O and C-H⋯O hydrogen bonds.
authors.affiliation: Department of Chemical Biology, School of Pharmaceutical Sciences, Peking University, Beijing 100191,  People's Republic of China.
authors.forename: Gong
authors.initials: G
authors.lastname: Li
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Wang
authors.forename: Zhili
authors.initials: Z
authors.lastname: Zhang
authors.forename: Junyi
authors.initials: J
authors.lastname: Liu