1. Computational Carbon Chemistry Group, Heidelberg Institute for Theoretical Studies (HITS gGmbH), 69118Heidelberg, Germany
2. Interdisciplinary Center for Scientific Computing, Heidelberg University, 69120Heidelberg, Germany
3. European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000Grenoble, France
4. Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074Aachen, Germany