Figure 1: GC-MS/MS MRM chromatograms of extracts from Angelica roots. (a) Chemical structures of ferulic acid, butylphthalide, Z-butylidenephthalide, senkyunolide A, Z-ligustilide, and paeonol were shown. (b) GC-MS MRM chromatograms of ethyl acetate extracts of Angelica roots (from Gansu, China). One μL was injected. The information for each peak was indicated: (1) ferulic acid, (2) butylphthalide, (3) Z-butylidenephthalide, (4) senkyunolide A, (5) Z-ligustilide, and (IS) paeonol. Representative chromatograms are shown, .