(1S,1′S,2′R,4a’S,9a’S,9b’R)-1′-Acet­yloxy-2,4′-dioxo-2′,4′,4a’,7′,8′,9′,9a’,9b’-octa­hydro-1′H,2H-spiro­[ace­naphthyl­ene-1,5′-pyrano[4,3-a]pyrrolizin]-2′-ylmethyl acetate

In the title compound C(26)H(25)NO(7), the mean plane through the lactone-substituted ring of the pyrrolizidine moiety forms dihedral angles of 78.46 (6) and 58.28 (8)° with the ace­naphthyl­ene moiety and the sugar based-lactone ring, respectively. The sum of the angles at the the N atom of the pyrrolizidine ring (335.0°) is in accordance with sp (3) hybridization. Some atoms of the acetate group are disordered and were refined using a split model [occupancy ratio 0.673 (10):0.327 (10)].