... and alkaloid screening of African (Bisset, 1970; Bisset and Phillipson, 1971) and Asian ... Usually, a volume of between 20 and 30 pi could be applied to the TLC ... the related compounds strychnobrasiline (17b) and alvimine (15c), and strychnosilinp (15b) (Marini Bettolo et al., 1982 ...