It has been demonstrated that a number of ben-zo~ a] phenoxazonium salts related to Kile Blue dyes possess tumor growth retarding action in mice as well as antituberculous action in mice. 3 We have synthesized for evaluation as potential cancer chemotherapeutic agents some N-dialkylaminoalkyl and N-his@-chloroethy1) aminoethyl derivatives of benzo [a] phenoxazine (I) and benzo [b]-phenoxazine (11). The so-called “nitrogen mustard” types ( ...