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Xanthotoxin, bergapten, oxypeucedanin, imperatorin, phelllopterin and isoimperatorin content in Baizhi roots dried by four methods. Roots were extracted with methanol and underwent HPLC–DAD analysis (n = 5). Data are mean ± SD absorbance (310 nm). Means within the same treatment followed by the same letter(s) are not significantly different at 5% level by Fisher’s least significant difference (LSD) test
