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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.

5-Methoxy-1,2′,3-trimethyl-4,6-dioxa-2-azaspiro[bicyclo[3.2.0]hept-2-ene-7,4′-isoquinoline]-1′,3′(2′H,4′H)-dione