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4,4'-Dihydroxybenzophenone-2,4-dinitrophenylhydrazone (A-007) formed stable double salts with phenothiazin-5-ium salts (2a-d), which have improved in vitro anticancer activities, as compared to A-007 alone. The stable salt between methylene blue (2a) and A-007 allowed the latter to diffuse into the dermis layers of skin. It is anticipated that these new salts will allow A-007 to penetrate into the...
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