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The naturally occurring enediynes. (a) The 9-membered enediynes include neocarzinostatin (1), C1027 (2), maduropeptin (3), kedarcidin (4), and N1999A (5). (b) The 10-membered family includes calicheamicin (6), dynemicin (7), esperamicin (8), namenamicin (9), and shishijimicin (10). The enediyne core structures are highlighted in black.
