Juncins I-M, five new briarane diterpenoids from the Indian Ocean gorgonian Junceella juncea Pallas.

Five new diterpenoids, juncins I-M (1-5), of the briarane skeleton have been isolated from the Indian Ocean gorgonian Junceella juncea in addition to four known derivatives, gemmacolides A-C (6-8) and juncin H (9). The structures of 1-5 were established by the interpretation of spectroscopic data.