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Chemical compound
The correct title of this article is Benzothiophene. The substitution of any brackets is due to technical restrictions.
The similarly named Benzothiophene is an isomer with the sulfur in the position adjacent to the benzene ring. Benzothiophene is more stable and far more commonly encountered.
References
Cava, Michael P.; Lakshmikantham, M. V. (1975). "Nonclassical Condensed Thiophenes". Accounts of Chemical Research. 8 (4): 139–44. doi:10.1021/ar50088a005.