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2,2,4,4,6,6,7,7-OCTAPHENYL-1,3,5-TRIOXA-2,4,6,7-TETRASILACYCLOHEPTANE 2,2,4,4,6,6,7,7-OCTAPHENYL-1,3,5-TRIOXA-2,4,6,7-TETRASILACYCLOHEPTANE