14-De­oxy-11,12-didehydro-3,19-isopropyl­ideneandrographolide

The title compound, (E)-3-[2-(3,3,6a,10b-tetra­methyl-8-meth­yl­­eneperhydro­naphtho[2,1-d][1,3]dioxin-7-yl)vin­yl]furan-2(5H)-one, C23H32O4, an andrographolide analogue, was semi-synthesized from 14-de­oxy-11,12-didehydro­andro­grapholide. All the six-membered rings in the structure adopt chair conformations. The crystal structure is stabilized by C—H⋯O inter­actions, which form a two-dimensional network parallel to the ab plane