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erltinib Dimethyl erlotinib Erlotinib impurity I Erlotinib metabolite M12 O-DESMETHYL ERLOTINIB-D8 HCL O-Desmethyl Erlotiniβ-d8 HCl 4-[(3-ETHYNYLPHENYL)AMINO]-6,7-BIS(2-HYDROXYETHOXY)QUINAZOLINE 2-[[4-(3-ethynylanilino)-7-(2-hydroxyethoxy)-6-quinazolinyl]oxy]ethanol 2,2,-((4-((3-ethynylphenyl)amino)quinazoline-6,7-diyl)bis(oxy))diethanol 4-[(3-Ethynylphenyl)amino]-6,7-bis(2-hydroxyethoxy)quinazoline USP/EP/BP Ethanol, 2,2'-[[4-[(3-ethynylphenyl)amino]-6,7-quinazolinediyl]bis(oxy)]bis- 2,2'-((4-((3-ethynylphenyl)amino)quinazoline-6,7-diyl)bis(oxy))bis(ethan-1-ol)