8ß-Acet-oxy-14α-benzo-yloxy-N-ethyl-3α,10ß,13ß,15α-tetra-hydr-oxy-1α,6α,16ß-trimeth-oxy-4ß-(methoxy-methyl-ene)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.

Alkaloids of Aconitum laeve and their anti-inflammatory antioxidant and tyrosinase inhibition activities.

A lycoctonine-type norditerpenoid alkaloid, swatinine (1), along with four known norditerpenoid alkaloids, delphatine (3), lappaconitine (4), puberanine (5), and N-acetylsepaconitine (6), and were isolated from the aerial parts of Aconitum laeve Royle. Compound 2 has been isolated for the first time from a natural source. The structure of compound 1 was deduced on the basis of spectral data. The anti-inflammatory, antioxidant and tyrosinase inhibition studies on all six compounds have also been carried out.