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3Isolation of highly pure erlotinib hydrochloride by recrystallization after nucleophilic substitution of an impurity with piperazine, Research on Chemical Intermediates Kleemann, A.; Engel, J.; Kutscher, B.; Reichert, D., Pharmaceutical Substances [Online], Thieme: Stuttgart, (2005)..
Erlotinib hydrochloride, Pharmaceutical Substances