Simultaneous determination of five effective components in Rhizoma Chuanxiong by RP-HPLC Study on degradation products of senkyunolide A and senkyunolide I Study on degradation products of senkyunolide A and senkyunolide I Pharmacokinetic study of ligustilide, senkyunolide A, and butylphthalide in supercritical extraction fraction from Xiongqiong Decoction in rats Chemical constituents from aerial parts of Ligusticum sinense cv. chaxiong Studies on chemical constituents of Ligusticum chuanxiong