Four new sesquiterpenoid nitrobenzoyl esters (1-4) have been isolated from organic extracts of the culture broth and myeelia of Aspergillus versicolor, a fungus isolated from the surface of the Caribbean green alga Penicillus capitatus. The structures of the four compounds were determined through extensive analysis of ¹H NMR, ¹³C NMR, HMQC, and HMBC data. 9α,14-Dihydroxy-6β-pnitrobenzoylcinnamolide (1) displayed significant cytotoxicity against HCT-I16 human colon carcinoma cells in vitro and exhibited moderately selective cytotoxicity toward a panel of renal tumor cell lines.