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Chemical structures of 21 reference compounds of XSHG (1, trigonelline; 2, stachydrine hydrochloride; 3, protocatechuic acid; 4, hydroxysafflor yellow A; 5, chlorogenic acid; 6, amygdalin; 7, caffeic acid; 8, leonurine hydrochloride; 9, liquiritin; 10, ferulic acid; 11, zingerone; 12, isoliquiritoside; 13, senkyunolide I; 14, senkyunolide H; 15, liquiritigenin; 16, glycyrrhizic acid; 17, 6-gingerol; 18, senkyunolide A; 19, ligustilide; 20, butylidenephthalide; 21, 6-shogaol).
