The IUPAC nomenclature of S-atom PACs is also similar to that for N-PACs. Thus the "trivial" name thiophene (XIV) is a basis for the common names of S-heterocycles containing one endocyclic S-atom in a 5-membered fused ring. Addition of two benzo groups gives dibenzothiophene (XV):
Names of S-heterocycles with two S-atoms in a 6-membered ring are based on the thianthrene structure, XVI (Later et al., f 990):
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