Nalmefene Impurity D Catalogue N211334 CAS 1058708-33-0 M.W 323.44 M.F C21H25NO2 Specifications FAQs (4R,4aS,7aS,12bS)-3-(Cyclopropylmethyl)-7-methylene-1,2,3,4,5,6,7,7a-octahydro-4aH-4,12-methanobenzofuro[3,2-e]isoquinolin-4a-ol