[Chemical studies on the constituents of Phyllanthus urinaria L].

Two new phenolic compounds (crystal VI and crystal IX) have been isolated from Phyllanthus urinaria L. (Euphorbiaceae). Their structures were determined by analysis of their UV, IR, 1H-NMR, 1H-1H COSY, 13C-1H COSY, long range 13C-1H COSY, DEPT, EIMS and HREIMS spectral data. Crystal VI was determined as methyl brevifolincarboxylate. Crystal IX was elucidated as trimethyl ester dehydrochebulic acid. All of the signals of the 13C-NMR of these two new compounds have been assigned mainly according to DEPT, 13C-1H COSY and long range 13C-1H COSY. Accompanying these two new compounds, 8 known compounds have been isolated. By using chemical reactions, UV, IR, 1H-NMR, MS, their structures were elucidated as n-octadecane(I), beta-sitosterol(III), ellagic acid(IV), daucosterol(V), kaempferol(VII), quercetin(VIII), gallic acid(X) and rutin(XI). Crystal II is an aldehyde, its structure elucidation is in progress.

[Studies on the chemical constituents of Cynanchum thesioides].

Fourteen constituents were isolated from Cynanchum thesioides (Freyn) K. Schum. On the basis of chemical and spectral data, seven of them have been identified including two new compounds: glyceride-1,3-dipalmito-2-sorbate (4), and thesoideaside (7); and five known compounds: beta-amyrin acetate (I), lupeol acetate (2), alpha-amyrin caprylate (3), tamarixetin (5) and tamarixetin-3-O-beta-D-galacto-pyranoside (6).