In the conduct of synthetic efforts on the antitumor antibiotic (+)-CC-1065 (1) and functionally related agents we have noted the instability of PDE-I (2), PDE-I1 (31, PDE-I dimer (4), and structurally related intermediates to mild, oxidative conditions. 2 We have suggested that the oxidative lability of the central and right-hand subunits of (+)-CC-1065 and structurally related agents may be due (1)(a) National Institutes of Health research career ...