thiohemiacetals

https://doi.org/10.1351/goldbook.T06355
Compounds of structure R2C(SR')OH or R2C(OR')SH (monothiohemiacetals), or R2C(SR')SH (dithiohemiacetals), R' ≠ H.
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1372 (https://doi.org/10.1351/pac199567081307)