Steroidal ketones from the sponge geodia cydonium
Migliuolo, A.; Piccialli, V.; Sica, D.
Lloydia 53(5): 1262-1266
Four 4-ene-3,6-diketosteroids 1-4 have been isolated from the sponge Geodia cydonium along with 4-ene-3-ketosteroids 5-8. The structure of these compounds was deduced by analysis of spectral data. Partial synthesis of compound 1 confirmed the structure assignment of 4-ene-3,6-diketones.