[1] Natl Univ Singapore, Dept Chem, Inst Life Sci, Singapore 117543, Singapore
[2] Natl Univ Singapore, Med Chem Program, Inst Life Sci, Singapore 117543, Singapore
[3] Hunan Univ Technol, Changsha, Hunan, Peoples R China
[4] Hangzhou Normal Univ, Key Lab Organosilicon Chem & Mat Technol, Minist Educ, Hangzhou 310012, Zhejiang, Peoples R China