(3aS*,10R*,10aS*,10bS*,13R*,13aR*)-8-Formyl-6-hydroxy-13-methoxy-1,1,7-tri­methyl-5-oxo-1,2,3,3a,5,9,10,10a,13,13a-deca­hydro­cyclo­hepta­[c]­furo­[3,4-e]­chromen-10-yl acetate

The title compound, C₂₃H₃₀O₈, was prepared from macrocalyxin A and its structure was established from the ESI-MS, ¹H NMR, ¹³C NMR and X-ray crystallographic data. Two unique mol­ecules are present in the asymmetric unit.

5-(4-Methoxy­phen­yl)-1-phenyl­pyrazolidin-3-one

The title compound, C₁₆H₁₆N₂O₂, was synthesized by the reaction of eth­yl 3-(4-methyl­phen­yl)acrylate and phenyl­hydrazine. There are inter­molecular N—H...O hydrogen bonds and C—H...π inter­actions.

(3S,5R,6S,7S,10S,11R,15S,18R,19R)-12,12-Dimethyl-2-methyl­ene-1,17-dioxo-9,16-dioxapenta­cyclo[14.2.1.0^6,18.0^7,11.0^7,15]nona­deca-5,10,19-triyl triacetate

The title compound, C₂₆H₃₂O₁₀, was prepared from macrocalyxin A and is built up from five fused rings, three six-membered and two five-membered. The relative absolute configuration was deduced from the known configuration of the starting material.