4-O-trans-caffeoylquinic acid is a cinnamate ester obtained by formal condensation of the carboxy group of trans-caffeic acid with the 4-hydroxy group of (+)-quinic acid. It has a role as a metabolite and a hepatoprotective agent. It is a cinnamate ester and a cyclitol carboxylic acid. It is functionally related to a trans-caffeic acid and a (+)-quinic acid.