is conjugate acid of tertiary ammonium ion hydroxychloroquine(2+) PMID:25693996 hydroxychloroquine dication 337.890 +2 337.19099 C18H28ClN3O A quinolinium ion obtained by protonation of the quinoline nitrogen and tertiary amino group of the antimalarial drug hydroxychloroquine. It is the major species at pH 7.3. XXSMGPRMXLTPCZ-UHFFFAOYSA-P CHEBI:149564 7-chloro-4-({5-[ethyl(2-hydroxyethyl)azaniumyl]pentan-2-yl}amino)quinolinium C=12C(NC(CCC[NH+](CCO)CC)C)=CC=[NH+]C1C=C(C=C2)Cl InChI=1S/C18H26ClN3O/c1-3-22(11-12-23)10-4-5-14(2)21-17-8-9-20-18-13-15(19)6-7-16(17)18/h6-9,13-14,23H,3-5,10-12H2,1-2H3,(H,20,21)/p+2 chebi_ontology quinolinium ion hydroxychloroquine