Gefitinib Impurity 3 Catalogue G420571 CAS 1502829-45-9 M.W 574.09 M.F C29H37ClFN5O4 Specifications FAQs N-(3-Chloro-4-fluorophenyl)-7-methoxy-6-(3-morpholinopropoxy)-N-(3-morpholinopropyl)quinazolin-4-amin