Praeruptorin A is a kind of natural compounds, has the function such as calcium ion antagonist, widely exists in umbrelliferae plant before white PeucedanumpraeruptorumDunn hu and other plants. Pyranocoumarin is a kind of horn type pyranocoumarin extracted from the root of Pyranocoumarin. It is the main active component of Pyranocoumarin. It is white needle-like crystal, fat soluble and easily soluble in organic solvents.

(+) - PraeruptorinA is cis - lactone (CKL) second esterification product, is made up of white flowers before hu (PeucedanumpraeruptorumDunn) dry root of PeucedaniRadix the main active component. (±)-PraeruptorinA has been widely used as one of the traditional Chinese medicines for the study of cough with thick phlegm and dyspnea, spontaneous cough and upper respiratory tract infections. (±) -Praeruptorina is primarily used as a Ca2+- reflux blocker in the study of hypertension.

It has the function of relieving cough, eliminating phlegm and relieving asthma, inhibiting Ca inflow, promoting K channel opening, and inhibiting acute myocardial IRI.