Cytotoxic Polyacetylenes from the Marine Sponge Petrosia sp.

Abstract
Three C46 (1−3) and three C30 (4−6) polyacetylenic alcohols with cytotoxic activity against a small panel of human solid-tumor cell lines have been isolated from the marine sponge Petrosia sp. Although compound 1 was identified as the stereoisomer of petrocortyne A, the structures of compounds 2−5 have not been previously reported and were established by spectral methods. Compound 6 was identified as the known compound petrosiacetylene D. The stereochemistry of compounds 1−5 was determined by the modified Mosher's method.