esomeprazole

noun

es·​omep·​ra·​zole ˌes-ō-ˈmep-rə-ˌzōl, -ˈmē-prə-, -ˌzȯl 

: an isomer of omeprazole that is administered in the form of its magnesium salt (C₁₇H₁₈N₃O₃S)₂Mg especially in the treatment of erosive esophagitis, gastroesophageal reflux disease, and duodenal ulcer see nexium