Hernsubanine E， a new hasubanan alkaloid from Stephania hernandifolia(3)
The 1H-1H COSY and HMQC spectra revealed the presence of a methylenedioxy group and isolated -CH2CHORCHOR-， -CH2CHOR-， -CH2CH2- fragments(Fig. 2). Further examination of the 1H-，13C-，and 2D-NMR data and the degrees of unsaturation of compound 1 suggested that 1 was similar to the known alkaloid hernsubanine A(Fig. 1)[7] except for the substituent groups at C-6. In 1 ......
您现在查看是摘要页，全文长 2816 字符。