[1] McMaster Univ, Dept Chem & Chem Biol, Hamilton, ON L8S 4L8, Canada
[2] McMaster Univ, Dept Biochem & Biomed Sci, Hamilton, ON L8S 4L8, Canada
[3] Univ Texas Med Branch, Dept Pharmacol & Toxicol, Chem Biol Program, Galveston, TX 77555 USA
[4] Heriot Watt Univ, Inst Biol Chem Biophys & Bioengn, Sch Engn & Phys Sci, Edinburgh EH14 4AS, Midlothian, Scotland