11,12-SECO-12,13-DIDEHYDROMULTIFLORINE PERCHLORATE HYDRATE

The structure of 11,12-seco-12,13-didehydromultiflorine perchlorate hy drate [IUPAC name: 3-(but-3-enyl)-10-oxo-1,2,3,4,5,6,11, 11a-octahydro -10H-1,5-methanopyrido[1,2-a][1 ,5]diazocinium perchlorate hydrate], C 15H23N2O+.ClO4-.H2O, a new alkaloid found in lupin plants, has been co nfirmed by X-ray analysis. The cation is formed by protonation of the butenyl-bonded N atom, N16. There is significant conjugation in the N1 -C2=C3-C4=O4 fragment of the cation. The structure is partially disord ered and the molecular packing is governed by a network of intermolecu lar hydrogen bonds.