Spiro[10,12-methano-4H,5H,21H-oxireno[8,9][1,6,12]trioxacyclooctadecino[3,4-d][1]benzopyran-11(10H),2'-oxirane](9CI);Spiro[12,14-methano-3H,19H,20H-oxireno[8,9][1,6,12]trioxacyclooctadecino[3,4-d][1]benzopyran-13(14H),2'-oxirane]
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