“The results showed that P-gp efflux was the main …] > 50 µM. The selective P-gp inhibitors CP100356 N-(3,4-dimethoxyphenethyl)-4-(6,7-dimethoxy-3,4-dihydroisoquinolin-2[1H]-yl)-6,7-dimethoxyquinazolin-2-amine ] and PSC833 [… the Qi accumulation in slices in … the jejunum and ileum.”