Structural optimization and evaluation of butenolides as potent antifouling agents: modification of the side chain affects the biological activities of compounds - Yongxin Li; Fengying Zhang; Ying Xu; Kiyotaka Matsumura; Zhuang Han; Lingli Liu; Wenhan Lin; Yanxing Jia; Pei-Yuan Qian (Biofouling, 2012)