The utility of the spermidine moiety as the homing device for the selective delivery of chemotherapeutic and diagnostic agents into cancer cells was explored. Two spermidine analogs containing a cytotoxic agent were synthesized, N-[3, 4-bis (benzyloxy) phenethyl]- Na-(3-amino-propyl)-L-ornithinamide trihydrochloride, la and N-[4-[bis (2-chloroethyl) amino] phenethyl]-Nu-(3-aminopropyl)-~-ornithinamide tetrahydrochloride, l b. These compounds ...