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The full structure of ganefromycin alpha has been determined. The relative
configurations were determined from (3)J(H,H) coupling constants and NOE da
ta, while the absolute configurations in moieties A and a were determined s
eparately by difference CD of their acylate derivatives, which showed typic
al exciton couplets, The configurations of the stereogenic centers in ganef
romycin alpha are 8S, 9S, 11R, 12S, 13S, 21S, 22R, 23R, 24R, and 26S.