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2,13-DITERT-BUTYL-6,7,9,10,17,18,20,21-OCTAHYDRODIBENZO[E,N][1,4,10,13,7,16]TETRAOXADITHIACYCLOOCTADECINE 2,13-DITERT-BUTYL-6,7,9,10,17,18,20,21-OCTAHYDRODIBENZO[E,N][1,4,10,13,7,16]TETRAOXADITHIACYCLOOCTADECINE