The synthesis of five new tetracyclic benzofurocoumarin (benzopsoralen) analogues is described. Their
inhibitory effects on the growth of three human tumor cell lines (MDA MB 231 (breast adenocarcinoma),
HeLa (cervix adenocarcinoma) and TCC-SUP (bladder transitional cell carcinoma) were evaluated, and
discussed in terms of structureeactivity relationship