title: 5-Meth-oxy-1,2',3-trimethyl-4,6-dioxa-2-aza-spiro-[bicyclo-[3.2.0]hept-2-ene-7,4'-isoquinoline]-1',3'(2'H,4'H)-dione.
abstract: In the isoquinoline ring system of the title mol-ecule, C(16)H(16)N(2)O(5), the N-heterocyclic ring is in a half-boat conformation. The dioxaaza-spiro ring is essentially planar [maximum deviation = 0.022 (1) Å] and forms a dihedral angle of 24.56 (4)° with the benzene ring.
authors.forename: Hoong-Kun
authors.initials: HK
authors.lastname: Fun
authors.forename: Ching Kheng
authors.initials: CK
authors.lastname: Quah
authors.forename: Chengmei
authors.initials: C
authors.lastname: Huang
authors.forename: Haitao
authors.initials: H
authors.lastname: Yu