“…Examples include 2,2,2-trifluoroethanethiol (CF 3 CH 2 SH), trifluorothioacetic acid (CF 3 COSH), 1,2-ethanedithiol (HSCH 2 CH 2 SH), thiiranemethanethiol (C 2 H 3 SCH 2 SH), aminoethanethiol (H 2 NCH 2 CH 2 SH), − methylthioglycolate (HSCH 2 COCH 3 ), propa-1,2-dienethiol (H 2 CCCHSH), 2-furanmethanethiol (C 4 H 3 OCH 2 SH), cyclopropanemethanethiol (C 3 H 5 CH 2 SH), propargyl mercaptan (HSCH 2 CCH), − 2-propenethiol (H 2 CCHCH 2 SH), 3-mercaptopropionitrile (HSCH 2 CH 2 CN), 3-butene-1-thiol (HSCH 2 CH 2 CHCH 2 ), , 3-butyne-1-thiol (HSCH 2 CH 2 CCH), and ( Z )-3-mercapto-2-propenenitrile (HSCHCHCN) . The present investigation of mercaptoacetonitrile (HSCH 2 CN) is an extension of our longstanding interest in internal H bonding in general and in thiols in particular …”