Antitumor activity of caffeic acid 3,4-dihydroxyphenethyl ester and its pharmacokinetic and metabolic properties - Guo, X; Shen, L; Tong, Y H; Zhang, J; Wu, G; He, Q; Yu, S R; Ye, X W; Zou, L B; Zhang, Z Z; Lian, X Y (Phytomedicine, 2013)