1. Laboratory of Organic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland.
2. Global Discovery Chemistry, Novartis Institutes for Biomedical Research, Novartis Pharma AG, 4056 Basel, Switzerland.
3. Global Discovery Chemistry, Novartis Institutes for Biomedical Research, Novartis Pharma AG, Cambridge, MA 02139, USA.