Lumateperone- 13 C,d 3 (ITI-007- 13 C,d 3 ) tosylate is 13 C and deuterium labeled Lumateperone (tosylate). Lumateperone (ITI-007) tosylate is a 5-HT2A receptor antagonist (Ki = 0.54 nM), a partial agonist of presynaptic D2 receptors and an antagonist of postsynaptic D2 receptors (Ki = 32 nM), and a dopamine D1 receptor modulator. Lumateperonetosylate has anticancer activity and can also be used in studies of psychiatric disorders such as schizophrenia.