Compounds having the structure R2C=S=O (R ≠ H). (Also known by the disapproved term @S06108@ which comprises thioaldehyde S-oxides and thioketone S-oxides.)
Source: PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1372 [Terms] [Paper]