Methyl 4-((1S,2R,3aS,8bS)-2-acetoxy-1-(hydroxymethyl)-2,3,3a,8b-tetrahydro-1H-cyclopenta[b]benzofuran-5-yl)butanoate

This compound is a pharmaceutical intermediate used as an impurity reference standard for Beraprost, a pharmaceutical substance. It features a fused ring system with multiple functional groups including an alcohol and ester moieties.