“…Chicoric acid can be obtained from isolated and purified plant materials (Table 1 ) or synthesized (Scarpati and Oriente, 1958 ; Synoradzki et al, 2005 ). Pure chicoric acid is a white powder (Synoradzki et al, 2005 ; personal observation), and now available as a purified standard via numerous chemical companies (e.g., Cerilliant Chemical Company, Indofine Chemical Company, Inc., Sigma-Aldrich Co, LLC, etc.). The most abundant natural form is L-chicoric acid [i.e., (-)-chicoric acid, 2,3-dicaffeoyl-L-tartaric acid, 2,3- O -dicaffeoyltartaric acid, 2R,3R- O -dicaffeoyltartaric acid, or di- E -caffeoyl-(2R-3R)-(-)-tartaric acid] and has been reported in the majority of the plants listed in Table 1 , but the stereoisomer meso -chicoric acid (i.e., dicaffeoyl- meso -tartaric acid or di- E -caffeoyl-(2R-3S)-(-)-tartaric acid) has also been reported at a lesser levels in horsetail sprouts ( Equisetum arvense L.) (Veit et al, 1991 , 1992 ; Hohlfeld et al, 1996 ), iceberg lettuce ( Lactuca sativa L.) (Baur et al, 2004 ; Luna et al, 2012 ), and purple coneflower ( Echinacea purpurea L. Monech) (Perry et al, 2001 ).…”