The molecule is 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. It is a quinolinium ion and a tertiary ammonium ion. It is a conjugate acid of a hydroxychloroquine.
4-[(7-chloroquinolin-1-ium-4-yl)amino]pentyl-ethyl-(2-hydroxyethyl)azanium