Used primarily in research settings as a metabolite of chloroquine, it helps in studying drug metabolism and pharmacokinetics. It has been investigated for its potential role in understanding resistance mechanisms in antimalarial treatments. Due to its structural similarity to chloroquine, it may exhibit weak antimalarial activity, but it is not used therapeutically. It also serves as a reference standard in analytical testing and toxicology studies to detect and quantify chloroquine breakdown in biological samples.