Crystal structure of syn-1-acetyl-9′aH-8′- methoxyspiro[indole-3,2′-oxeto[3′,2′:4,5]furo[3,2-g][1] benzopyran]2,6′-dione

The crystal structure of syn-1-acetyl-9′a-hydro-8′-methoxyspiro[3H-indole-3,2′(2a′H) oxeto[3,2-g]furo[3,2-g]benzo[ b]pyran-2,6′-dione 1 was determined by X-ray diffraction analysis. It possesses P2(1)/c space group symmetry, with a = 12.391(3), b = 15.035(3), c = 9.5435(19) A, β = 93.66(3)○, and Dcalc. = 1.517 Mg/m3 for Z = 4.