Abstract
Ethyl acetate extracts of two phenotypic color variants of the endemic South African soft coral, Capnella thyrsoidea yielded the known steroid 5α-pregna-l,20-dien-3-one ( 1) and a further six new compounds, 16ß-hydroxy-5α-pregna-l,20-dien-3-one 16-acetate ( 2), 3α,16ß-dthydroxy-5α-pregna-1,20-diene 3,16-diacetate ( 3) and four xemcane diterpenes, the tsitsixenicins A-D ( 6, 10–12). Standard spectroscopic methods were used to determine the structures and stereochemistry of these compounds This is the first reported isolation of xenicane diterpenes from the soft coral family Nephtheiidae Compounds 6 and 10 inhibit Superoxide production m both rabbit and human cell neutrophils.
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