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.diegojavierfares.com/top-super-SOLD-Used-Olympia-Cremina-1979-Refurbished-120-volt-Brown-save-big/