Corticatic Acids D and E, Polyacetylenic Geranylgeranyltransferase Type I Inhibitors, from the Marine Sponge Petrosia corticata

Abstract
Two new polyacetylenic acids, corticatic acids D (2) and E (3), have been isolated from the marine sponge Petrosiacorticata along with the known corticatic acid A (1) as geranylgeranyltransferase type I (GGTase I) inhibitors. Their structures were elucidated on the basis of spectroscopic and chemical methods. Compounds 1−3 inhibited GGTase I from Candida albicans with IC50 values of 1.9−7.3 μM.