(S)-Omeprazole is the (S)-enantiomer of Omeprazole a gastric proton-pump inhibitor. (S)-Omeprazole is more potent that its (R)-enantiomer and is used in the treatment of gastroesophageal reflux disease as well as gastrointestinal ulcers associated with Crohn's disease.CAS Number:161796-78-7Molecular Formula:C₁₇H₁₈N₃NaO₃SAppearance:Pale Beige to Beige SolidMelting Point:196-200°C (dec.)Mol. Weight:367.4Solubility:DMSO (Slightly), Water (Slightly)Storage:4°C