The immobilization of SiW<sub>12</sub>O<sub>40</sub><sup>4-</sup>in poly(4-aminoazobenzene)filmwas done by electrochemical method.According to the continuous cycl
The graphtheory method is used to enumerate the numbers of constitutions,configurations,chiral and achiral configurations of substituted crown ethers.The numeri
Four new taxane diterpenoids were isolated fromthe bark of Taxus yunnanensis.Their structures wereelucidated as the new skeleton with 5/7/6/4 membered ringsby s