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3,6-DIMETHYL-1,2,3,4,5,6-HEXAPHENYL-1,2,4,5-TETRAAZA-3,6-DISILACYCLOHEXANE 3,6-DIMETHYL-1,2,3,4,5,6-HEXAPHENYL-1,2,4,5-TETRAAZA-3,6-DISILACYCLOHEXANE