PHY34 is a cytotoxic compound in both HGSOC cell lines with an IC50 of 4 nM. It has nanomolar IC50s in both MDA-MB-435 and MDAMB-231 cell lines and is more cytotoxic against MDA-MB-231 (PHY34 IC50 in MDA-MB-435 = 23 nM, PHY34 IC50 in MDA-MB-231 = 5.2 nM). PHY34 treatment (100 nM) results in significant increases in early and late apoptotic cells in OVCAR3.