Duloxetine EP Impurity A Catalogue D260401 CAS 910138-96-4 (free base:116539-60-7) M.W 333.87 M.F C18H19NOS.HCl Specifications FAQs R)-N-methyl-3-(naphthalen-1-yloxy)-3-(thiophen-2-yl)propan -1-amine hydrochloride