Three New Alkaloids from the Marine Tunicate Cystodytes violatinctus

Abstract:  Three novel alkaloids, shermilamine D and E (1 and 2) and tintamine (3), two pyridoacridines (1 and 2), and one alkaloid possessing a new heterocyclic system have been isolated from the Indian Ocean tunicate Cystodytes violatinctus collected at the Mayotte Lagoon, Comoros Islands, northwest of Madagascar. The structures of all compounds were elucidated on the basis of spectroscopic data, mainly 1D and 2D NMR data.