test method:hplc english name: corydalis yanhusuo . latin name: corydalis yanhusuo w.t. wangpart . molecular formula: c21h25no4 . molecular weight: 355.42 . physics properties:melting point: 148-149°c . pharmacology function: ease pain,phenobarbital, partial anesthetic, prevent early high blood pression . action: 1) it has effect of promoting blood circulation to remove blood stasis and promoting circulation of qi to relieve pain, 2) it is often used for hypochondriac pain due to stagnation of the liver-qi, stomachache due to stagnation of the stomach-qi, hernial pain.