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ISOLATION AND IDENTIFICATION OF STER0IDAL SAPOGENINS FROM RHIZOME OF DIOSCOREA COLLETTIl VAR.HYPOGLAUCA STUDIES ON THE 19-ME CHEMICAL SHIFT RELATIONS WITH D5-PYRIDINE AND THE HYDROXY GROUPS IN RING A AND B OF STEROIDAL SAPOGENINS CARBON-13 NMR SPECTRA OF TEN STEROIDAL SAPOGENINS Isolation and Structural Elucidation of Sapogenins from Tupistra chinensis and Their Antifungal Acitivity Against Peronophythora litchii Studies on Chemical Constituents of Smilax menispermoidea D.C.