1. School of Biochemistry, University Walk, University of Bristol, BS8 1TD, UK
2. School of Chemistry, University of Bristol, Cantock's Close, BS8 1TS, UK
3. Department of Chemistry, King Faisal University, College of Science, Al-Ahsa 31982, Saudi Arabia
4. Discovery Sciences, Biopharmaceuticals R&D, AstraZeneca, Pepparedsleden 1, 431 83 Mölndal, Sweden
5. School of Natural and Environmental Sciences, Newcastle University, NE1 7RU, UK
6. Department of Biology and Biochemistry, University of Bath, Claverton Down, BA2 7AY, UK