DNA Topoisomerase I Inhibitor, Ergosterol Peroxide from Penicillium oxalicum - Kuo, Li-Ming Yang; Chen, Kuei-Yuh; Hwang, Shy-Yuan; Chen, Jin-Liang; Liu, Yen-Yin; Liaw, Chia-Ching; Ye, Po-Ho; Chou, Cheng-Jen; Shen, Chien-Chang; Kuo, Yao-Haur (Planta Medica, 2005)