Regioselective O-demethylation of scoparone (6,7-dimethoxycoumarin) to assess cytochrome P450 activities in vitro in rat. Effects of gonadal steroids and the involvement of constitutive P450 enzymes - Witkamp, R F; Nijmeijer, S M; Mennes, W C; Rozema, A W; Noordhoek, J; Van Miert, A S (Xenobiotica, 1993)