苯 ㄅㄣ ˇ běn 并 ㄅㄧㄥ ˋ bìng 噻 ㄙㄞ sāi 吩 ㄈㄣ fēn 苯 ㄅㄣ ˇ běn 並 ㄅㄧㄥ ˋ bìng 噻 ㄙㄞ sāi 吩 ㄈㄣ fēn benzothiophene C8H9, a heterocyclic compound (with one benzene ring and one cyclopentene ring)