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Esomeprazole drug molecule. Computer model of a molecule of the proton pump inhibitor drug esomeprazole (marketed as Nexium). Atoms are represented as spheres and are colour-coded: carbon (turquoise), hydrogen (white), oxygen (red), nitrogen (blue) and sulphur (yellow). Esomeprazole is used to treat gastric ulcers and gastro-oesophageal reflux disease. It works by inhibiting an enzyme involved in the final stages of gastric acid production.
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