Interactions of antitumor agents ametantrone∗∗Trade name for the salt of 1,4-bis[[2-[(2-hydroxyethyl)amino]ethyl]amino]-9,10-anthracenedione (Fig. 1, I). Abbreviations: HAQ, ANT; NSC-287513. and mitoxantrone (novatrone)††Trade name for the salt of 1,4-dihydroxy-5,8-bis[[2-[(2-hydroxyethyl)amino]ethyl]amino] -9,10- anthracenedione (Fig. 1, II). Abbreviation: DHAQ; NSC-279836 and NSC-301739. with double-stranded DNA