Determination of the hydroxycinnamate profile of 12 members of the Asteraceae family

► Chlorogenic acids and hydroxycinnamates based on cis and trans-cinnamic acids have identical MSn spectra. ► Chlorogenic acid regioisomers were easily distinguish by their characteristic tandem mass spectra. ► First time 1-p-coumaroyl-3-caffeoylquinic acid and 1-p-coumaroyl-3-caffeoylquinic acid were identified in nature.