What is "thiazoline"

n. (context organic compound English) An unsaturated heterocyclic compound containing a five-membered ring, one double bond, one nitrogen and one sulfur atom; any derivative of this compound

Thiazolines (or dihydrothiazoles) are a group of isomeric heterocyclic compound containing both sulfur and nitrogen in the ring. Although unsubstituted thiazolines are rarely encountered themselves, their derivatives are more common and some are bioactive. For example, in a common post-translational modification, cysteine residues are converted into thiazolines.