Allyl 2-(2,2-dimethyl-3a,6a-di­hydro­furo[3,2-d][1,3]dioxol-5-yl)-4-oxo-4H-chromene-3-carboxyl­ate

In the title compound, C(20)H(18)O(7), the dioxolane ring adopts an envelope conformation with the dimethyl-substituted C atom as the flap, and its mean plane makes a dihedral angle of 73.25 (2)° with the pyran ring mean plane. The furan ring makes dihedral angles of 67.43 (12) and 6.20 (11)° with the mean plane of the dioxolane and pyran rings, respectively. The O atom attached to the pyran ring deviates by 0.0219 (2) Å from its mean plane. In the crystal, mol­ecules are linked via C—H⋯O hydrogen bonds, forming chains along [010] and enclosing R (2) (2)(9) loops. They stack along the a axis with π–π inter­actions involving the 4H-chromene units [centroid–centroid distances of 3.6389 (13) and 3.6555 (13) Å]. The terminal CH(2)=CH- atoms of the allyl acetate group are disordered over two sets of sites with a refined occupancy ratio of 0.717 (6):0.283 (6).