19,20,22,23-tetrahydro-12H-7,11-nitrilo-6H-dibenzo[b,k][1,4,7,10,13]pentaoxacycloicosin;12H-7,11-Nitrilo-6H-dibenzob,k1,4,7,10,13pentaoxacycloeicosin, 19,20,22,23-tetrahydro-
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