title: 6-Formyl-2-naphthyl cis-1,5,7-trimethyl-2,4-dioxo-3-aza-bicyclo-[3.3.1]nonane-7-carboxyl-ate.
abstract: In the title compound, C(23)H(23)NO(5), the C(5)N ring adopts an envelope conformation with a C atom as the flap, whilst the saturated C(6) ring fused to it adopts a chair conformation. In the crystal, inversion dimers linked by pairs of N-H⋯O hydrogen bonds generate R(2) (2)(8) loops.
authors.affiliation: School of Chemistry & Materials Science, Ludong University, Yantai of Shandong, People's Republic of China.
authors.forename: Sheng-Guang
authors.initials: SG
authors.lastname: Xu
authors.forename: Chun-Hua
authors.initials: CH
authors.lastname: Wang
authors.forename: Jun-Shen
authors.initials: JS
authors.lastname: Liu
authors.forename: Xi-Guang
authors.initials: XG
authors.lastname: Liu
authors.forename: Long
authors.initials: L
authors.lastname: Li