O-methylnidurufin (38) and 6,8-di-O-methyl versiconol , respectively. Both versicolorin B and its hydroxyl derivative, 1'-hydroxyversicolorin B showed potent antioxidant activity as they displayed antioxidant capacity approximately equivalent to Trolox , while an old study revealed that 1'-hydroxyversicolorin B (34) (UCT1072M1) had potent cytotoxicity against the human cervical cell adenocarcinoma HeLa S3 and the human lung giant cell carcinoma Lu-65 with IC50 values of 2.1 and 2.2 μM, respectively .