Contribution from the Department of Chemistry, The Uniuersity of Arizona, Tucson, Arizona and the Department of Chemistry, Cornell University, Ithaca, New York Received December 17, 1971 ... Abstract : Tocinoic acid, the 20-membered cyclic disulfide ring of cysteinyltyrosylisoleucylglutaminylaspara~ny1- cysteine, which possesses the tocin ring of oxytocin, was synthesized by the stepwise p-nitrophenyl ester method. All protecting ...
