Senepodines B–E, new C22N2 alkaloids from Lycopodium chinense

Four new C22N2 Lycopodium alkaloids, senepodines B–E (), consisting of an octahydroquinoline ring and a quinolizidine ring have been isolated together with senepodine A () from the club moss Lycopodium chinense. The relative and absolute stereochemistry of were determined by combination of NOESY correlations and chemical transformation, while the absolute configuration of was assigned by exciton chirality method.