The title compounds(5a and 5b)were synthesized from ursolic acid and their structures were characterized by spectroscopic methods including ESI-MS,1H-NMR,13C-NM
A potassium silicophosphate,K2SiP4O13,has been synthesized in molten polyphosphoric acid.It crystalizes in the triclinic space group Pī(No.2)with a = 4.8327(10
Research backgroud: Bu-Shen-Yi-Qi formulae (BSYQF) is frequently used in the treatment of chronic inflammatory diseases in the respiratory system such as as