A class of compounds containing two rings connected through a single atom, with at least one of the rings being a heterocycle.
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1-methyl-4-hydroxy-4-(2'-phenyl-2'-aminoethyl)-piperidine
11-phenyl-5,11-dihydrodi(benzo[b]thieno)[3,2-b:2',3'-e]dihydropyridine 10,10,12,12-tetraoxide
