The title compound. C21H26NO4+·Br−. also known as R-methylnaltrexone (MNTX) bromide. is a selective peripherally acting μ-opioid receptor antagonist with a oroxymorphone skeleton. https://www.ealisboa.com/mega-deal-OtterBox-Defender-Case-for-Samsung-Galaxy-S23-Ultra-top-savings/