semicarbazide grew from the primaquine side. This method was more convenient for synthesis of a series of semicarbazides: various products could be obtained from the same precursor N-(4-((6-methoxyquinolin-8-yl)amino)pentyl)hydrazinecarbox-amide (10). Primaquine ureas 9a–f were prepared from primaquine benzotriazolide 8 and corresponding amines and urea 9g directly from primaquine and 4-chloro-3-(fluoromethyl)phenyl