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(1S,5'R,9R,11R,12S)-4',4',5,5'-Tetramethyl-6-methylidenespiro[13,15-dioxa-5,8-diazatetracyclo[7.6.0.01,12.03,8]pentadec-2-ene-11,2'-oxolane]-3',4,7,14-tetrone


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