Figure 1.
Chemical structures of the five iridoids. (A) Asperuloside (ASP); (B) Asperulosidic acid (ASPA); (C) Desacetyl asperulosidic acid (DAA); (D) Scandoside methyl ester (SME); and (E) E-6-O-p-Coumaroyl scandoside methyl ester (CSME).
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