CC-1065 (1, NSC-298223), an antitumor-antibiotic isolated from Streptomyces zelensis, initially identified by spectroscopic technique@ and confirmed in a single-crystal X-ray structure determinati~ n,~~ has been shown to possess exceptional, potent in vitro cytotoxic activity, antimicrobial activity, and confirmed, potent in vivo antitumor a~ tivity.~ In sharp contrast to the early observations made with simplified analogues of CC-1065 bearing ...