8β-Acet­oxy-14α-benzo­yloxy-N-ethyl-3α,10β,13β,15α-tetra­hydr­oxy-1α,6α,16β-trimeth­oxy-4β-(methoxy­methyl­ene)aconitane: aconifine from Aconitum karakolicum Rapaics

The title compound, C(34)H(47)NO(12), is the norditerpenoid alkaloid aconifine isolated from the leaves and tubers of Aconitum karakolicum Rapaics. It has a lycoctonine carbon skeleton and contains four six-membered rings and two five-membered rings; its geometry is similar to that observed in other lycoctonine-type diterpenoid alkaloids. There are two intra-molecular O-H⋯O hydrogen bonds which close five- and seven-membered pseudo-rings, respectively. In the crystal, two inter-molecular O-H⋯O hydrogen bonds cross-link the mol-ecules into double chains along the a axis.