14-Angeloyloxycacalohastine from Psacalium peltatum

The title compound [systematic name: (9-meth­oxy-3,5-dimethyl-5,6-dihydro­naphtho­[2,3-b]furan-4-yl)methyl 2-meth­yl­but-2-enoate], C₂₁H₂₄O₄, was isolated from matarique, or Psacalium peltatum (Kunth). The structure is almost planar. The angelo­yloxy group makes an angle of 62.08 (2)° with the furan­oeremophilane skeleton. The carbonyl O atom is disordered between two positions with a 76:24 ratio. The mol­ecules in the crystal are joined by very weak C-H-O inter­actions in the ac plane.