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The Collaborative International Dictionary
Thiophthene

Thiophthene \Thi*oph"thene\, n. [Abbreviated from thionaphthene.] (Chem.) A double thiophene nucleus, C6H4S2, analogous to thionaphthene, and the base of a large series of compounds.

Wiktionary
thiophthene

n. (context chemistry English) A double thiophene nucleus, C6H4S2, analogous to thionaphthene, and the base of a large series of compounds.