Abstract
The title compound has been synthesized as its disulfide by a classical route from the fully protected precursor N-BOC-S-trityl-δ-(L-α-aminoadipyl)-L-cysteinyl-D-valine bisbenzhydryl ester. Deprotection has been achieved by oxidative removal of the trityl group with iodine, followed by removal of BOC and benzhydryl using trifluoroacetic acid. The final product is obtained in 23% overall yield from D-valine.