The draft of the monograph Dithranol as it is scheduled for the Europe
an Pharmacopoeia needs some comments and corrections. The HPLC chromat
ogram for the analysis of dithranol and its degradation products exhib
its incomplete separation of dithranol and danthron, and a second syst
em is required for the determination of related substances. A newly de
veloped HPLC system is described to quantitate dithranol, its degradat
ion products and related substances simultaneously.