1. Institut Charles Gerhardt, CNRS UMR 5253; Université de Montpellier; 34095 Montpellier France
2. Centre for Theoretical and Computational Chemistry (CTCC), Department of Chemistry; University of Oslo; N-0315 Oslo Norway
3. Sorbonne Universités; UPMC Univ Paris 06, CNRS, Laboratoire de Chimie Théorique, UMR 7616; F-75005 Paris France