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Chemical constituents from flowers of Rosa chinensis Chemical constituents from flowers of Rosa chinensis Chemical constituents from Ziziphora clinopodioides Flavonoids from Beijing Propolis Qualitative and quantitative methods for Alpiniae Katsumadai Semen Chemical constituents from Alpinia coriacea Novel Neolignan from Penthorum chinense Chemical constituents from the roots of Goniothalamus cheliensis Chemical constituents from the roots of Goniothalamus cheliensis Preparation technology of propolis extract