Diacetylcercosporin is a perylenequinone produced by Cercospora and Septoria that has diverse biological activities. It inhibits the growth of P. falciparum strains that are sensitive and resistant to chloroquine and L. donovani parasites (IC50 = 3.1 μM) in vitro. Diacetylcercosporin exhibits cytotoxicity against SK-MEL, KB, BT549, and SK-OV-3 human cancer cell lines (IC50s = 4.8-8.7 μM). It is also a phytotoxin that inhibits the growth of lettuce and bentgrass at a concentration of 1.62 mM
4-oxo Docosahexaenoic acid (4-oxo DHA) is a putative metabolite of DHA with antiproliferative and PPARγ agonist activity. It inhibits the growth of several triple negative breast cancer cell lines (MCF-10F, trMCF, bsMCF, MDA-MB-231, and BT549) at 50-100 μM, however it increased proliferation of MCF-7 cells. 4-oxo DHA binds covalently to PPARγ and activates gene transcription in luciferase reporter assays and in dendritic cells with EC50 values of approximately 8-16 μM.