Thiocarbamates are a family of organosulfur compounds. There are two isomeric forms of thiocarbamate esters: O-thiocarbamates, ROC(=S)NR₂, and S-thiocarbamates, RSC(=O)NR₂. O-thiocarbamates can isomerise to S-thiocarbamates, for example in the Newman-Kwart rearrangement.