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The title compound (systematic name: 5,6β-dihydroxy-1α,14α,16β-trimethoxy-4-methyl-7β,8-methylenedioxy-20-ethylaconitan-6-yl acetate acetone monosolvate), C27H41NO8·C3H6O, was isolated from Delphinium bonvalotii Franch, and is a typical C19-diterpenoid alkaloid. The molecule has a lycoctonine carbon skeleton with four six-membered rings and three five-membered rings. Three six-membered rings adopt the chair conformations while the fourth adopts a boat conformation, while the five-membered rings have the envelope conformations. The solvent molecule links with the organic molecule via a classical O—H...O hydrogen bond. Weak C—H...O hydrogen bonding is present in the structure. An intramolecular O—H...O hydrogen bond also occurs.