Mention coffee, and caffeine is the chemical compound name that immediately springs to mind. However, whilst caffeine’s effects on the brain are well documented – it binds to adenosine receptors in the brain – it has relatively little impact when it comes to the taste of coffee. Coffee, as it turns out, is a cornucopia of chemical compounds that influence its taste; whilst some of these compounds are poorly characterised, one group of compounds about which plenty is known are the chlorogenic acids.