Macrocyclic pyrrolizidine alkaloids from Parsonsia laevigata

Parsonsianidine, a new minor macrocyclic pyrrolizidine alkaloid having two ethyl side-chains at C-11 and C-20, was isolated along with parsonsianine from the leaves of Parsonsia laevigata . Its structure was determined by spectral analyses. 17-Methylparsonsianidine, having the same plane structure as spiranine, was also identified.