Fig. (2) The chloroquine-Zn⁺⁺ complex. (A) Electronic distribution in the molecule of chloroquine, with the regions that could exert a potential electroattractive effect on the zinc cations colored pink. (B) Chemical structure of the chloroquine-Zn⁺⁺ complex. (C) 3-D structure of the chloroquine-Zn⁺⁺ complex with the zinc cation (dark grey) recognized by the tertiary amine.