What is "cyclohexylthiophthalimide"

Cyclohexylthiophthalimide (abbreviated CTP) is an organosulfur compound that is used in production of rubber. It is a white solid, although commercial samples often appear yellow. It features the sulfenamide functional group, being a derivative of phthalimide and cyclohexyl mercaptan. In the production of synthetic rubber, CTP impedes the onset of vulcanization.