[1] Univ Oxford, Dept Biochem, Oxford OX1 2JD, England
[2] Univ Oxford, Dept Chem, Oxford OX1 2JD, England
[3] Cardiff Univ, Coll Biomed & Life Sci, Cardiff CF10 3AX, S Glam, Wales
[4] Lincoln Univ, Sch Life Sci, Lincoln, England
[5] Vrije Univ Amsterdam, Div Med Chem, Amsterdam, Netherlands