[1] Univ Newcastle Upon Tyne, Sch Nat Sci Chem, No Inst Canc Res, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[2] Univ Newcastle Upon Tyne, Sch Med, No Inst Canc Res, Newcastle Upon Tyne NE2 4HH, Tyne & Wear, England
[3] De Novo Pharmaceut, Cambridge CB4 9ZR, England