| bioactive compounds from the gorgonian briareum polyanthes. correction of the structures of four asbestinane-type diterpenes. | our extended chemical investigation of the crude meoh-chcl3 extract of the gorgonian octocoral briareum polyanthes from puerto rico has led to the isolation of three eunicellin-type diterpenoids, 1-3, along with five (4-8) diterpenoids of the asbestinane-type and one (9) of the briarane-type of polycyclized diterpenes. the structures and relative stereochemistry of the new compounds 1-9 were established on the basis of spectroscopic analysis (1h nmr, 13c nmr, hmqc, hmbc, noesy). the biological a ... | 2006 | 17190449 |