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The title compound (delgradine), C 41 H 43 NO 12 , is a hetisine-type C 20 -diterpenoid alkaloid, isolated from the roots of  Aconitum carmichaeli  Debx. In the crystal structure, the mol­ecule assumes an U-shaped conformation, the terminal benzene rings being approximately parallel and partially overlapped with each other. The mol­ecule contains eight alicyclic and heterocyclic rings. Cyclo­hexane rings  A  and  B  adopt similar chair conformations; the six-membered rings  C ,  D  and  E  form a bicyclo­[2.2.2]octane system with a boat conformation for each six-membered ring, the six-membered heterocyclic ring  F  has a screw-boat conformation and both of the five-membered rings G and H have envelope conformations. The crystal structure contains inter­molecular O—H⋯O hydrogen bonding.

(1α,2β,3α,7α,11α,13β)-1,3,11-Triacetoxy-2,13-bis(benzyloxy)-7-hydroxy-21-methyl-N,19-secohetisan-19-al