Omeprazole-13C,d3 is a 13C-labeled and deuterium labeled Omeprazole. Omeprazole (H 16868), a proton pump inhibitor (PPI), is available for treatment of acid-related gastrointestinal disorders. Omeprazole shows competitive inhibition of CYP2C19 activity with a Ki of 2 to 6 µM[1]. Omeprazole also inhibits growth of Gram-positive and Gram-negative bacteria[2].Omeprazole is a potent brain penetrant neutral sphingomyelinase (N-SMase) inhibitor (exosome inhibitor)[3].