Erlotinib Impurity I Catalogue E212209 CAS 1624294-38-7 (free base:1058132-82-3) M.W 431.92 M.F C22H25N3O4.HCl Specifications FAQs 6,7-bis(2-methoxyethoxy)-N-(3-vinylphenyl)quinazolin-4-amine hydrochloride