Angelol B is a coumarin isolated from the roots of Angelica pubescens f. biserrata, which is passive diffusion as the dominating process in Caco-2 cell monolayer model[1].
[1]. Yang XW, et al. Absorption and transport of 6 coumarins isolated from the roots of Angelica pubescens f. biserrata in human Caco-2 cell monolayer model. Zhong Xi Yi Jie He Xue Bao. 2008 Apr;6(4):392-8.
















