Scavenging Effects of Daphnetin and Its Cu, Zn Complexes on superoxide Radical Studies on the Chemical Constituents of Stellera chamae jasme L. Preparation Method and Quality Control of Compound Daphne Injection Biotransformation of daphnetin by suspension transgenic hairy roots of Polygonum multiflorum Effects of glycyrrhiza extract on pharmacokinetics property of daphnetin in rats