How is N-(2-Benzyl-3-sulfanylpropanoyl)glycine (CAS: 76721-89-6) typically synthesized?

N-(2-Benzyl-3-sulfanylpropanoyl)glycine (CAS: 76721-89-6) is typically synthesized via a multi-step process involving the synthesis of a benzyl sulfide derivative, followed by its coupling with glycine. Commonly, the synthesis involves the use of thionyl chloride to generate the sulfide, followed by the addition of glycine under basic conditions. The yield is often around 70-80%, and the process is optimized for selectivity and purity using standard organic synthesis techniques.