Direct semi-synthesis of the anticancer lead-drug protoapigenone from apigenin, and synthesis of further new cytotoxic protoflavone derivatives - Hunyadi Attila; Chuang Da-Wei; Dankó Balázs Ödön; Chiang Michael Y; Lee Chia-Lin; Wang Hui-Chun; Wu Chin-Chung; Chang Fang-Rong; Wu Yang-Chang (Public Library of Science, 2011)