Mass spectral fragmentation pattern and spectroscopic rules of phloroglucinol constituents in plants of Dryopteris Adanson Research progress on mass spectral fragmentation behaviour of alkaloidsin Macleaya cordata Studies on the Aroma Constituents of Fuiien Ti Kuan Yin Tea, Se Chung Tea, Wu-I Shui Hsien Tea and Wu-I Chi Chung Tea in China Stuies on the Chemical Constituents of the Essential Oils from the Leaves of Aglaia odorata Lour Study on composition of essential oil in above-ground and root of Bupleurum malconense and root of B. chinense by AMDIS and retention index