16617-07-5 3-O-Methylnaltrexone Morphinan-6-one, 17-(cyclopropylmethyl)-4,5-epoxy-14-hydroxy-3-methoxy-, (5alpha)- Morphinan-6-one, 17-(cyclopropylmethyl)-4,5alpha-epoy-14-hydroxy-3-methoxy- N-Cyclopropylmethylnoroxycodone Naltrexone-3-methyl ether O3-Methyl-(-)-naltrexone