Ditopic thiacyclophanes containing the S(CH 2 ) 2 X(CH 2 ) 2 S (X = O, S) linkage. Synthesis and structures of 2,5,8,17,20,23-hexathia[9](1,2)[9](4,5)cyclophane and 5,20-dioxa-2,8,17,23-tetrathia[9](1,3)[9](4,6)-2,5-bis(ethoxy)cyclophane

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