The naturally occurring form of the amino acid cysteine (Problem 9.48) has the S configuration at its chirality center. On treatment with a mild oxidizing agent, two cysteines join to give cystine, a disulfide. Assuming that the chirality center is not affected by the reaction, is cystine optically active?

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NH2 NH2 NH2 но-сснCH,S—scH2снсо2н 2 HSCH2CHCO2Н Cysteine Cystine