Atenolol EP Impurity F Catalogue A214506 CAS 87619-83-8 M.W 473.56 M.F C25H35N3O6 Specifications FAQs 2,2'-((((isopropylazanediyl)bis(2-hydroxypropane-3,1-diyl))bis(oxy))bis(4,1-phenylene))diacetamide