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Determination of Emodin in "Yishen Capsule" by TLC Scanner Quantitative Determination of Astragalin A in Fengrutong Granule by TLC Scanner Comparative Analysis of Ursolic Acid in Crataegus pinnatifidav Bge. var. major N. E. Br. before and after Processing Determination of Loganin in Cornus officinalis Sieb.et Zucc.by TLC Scanner