Crystal structure and Hirshfeld surface analysis of dimethyl (1R*,3aS*,3a(1) R*,6aS*,9R*,9aS*)-3a(1),5,6,9a-tetra­hydro-1H,4H,9H-1,3a:6a,9-di­epoxy­phenalene-2,3-di­carboxyl­ate

The title di­epoxy­phenalene derivative, C(17)H(18)O(6), comprises a fused cyclic system containing four five-membered rings (two di­hydro­furan and two tetra­hydro­furan) and one six-membered ring (cyclo­hexa­ne). The five-membered di­hydro­furan and tetra­hydro­furan rings adopt envelope conformations, and the six-membered cyclo­hexane ring adopts a distorted chair conformation. Two methyl carboxyl­ate groups occupy adjacent positions (2- and 3-) on a tetra­hydro­furan ring. In the crystal, two pairs of C—H⋯O hydrogen bonds link the mol­ecules to form inversion dimers, enclosing two R (2) (2)(6) ring motifs, that stack along the a-axis direction and are arranged in layers parallel to the bc plane.