Crystal structure and Hirshfeld surface analysis of dimethyl (1 R ,3a S ,3a 1 R ,6a S ,9 R ,9a S )-3a 1 ,5,6,9a-tetrahydro-1 H ,4 H ,9 H -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.