Compounds having the structure acyl-S-acyl. Also called diacylsulfanes, e.g.
CH3C(=O)SC(=S)CH2CH3 acetic thiopropanoic thioanhydride.
See: acyl groups
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)