Supporting Information for On-Surface Synthesis of a Doubly Anti-Aromatic Carbon Allotrope

Funding was also provided by the Leverhulme Trust (Project Grant RPG-2017-032). Computational resources were provided by: Cirrus UK National Tier-2 HPC Service at EPCC (http://www.cirrus.ac.uk) funded by the University of Edinburgh and EPSRC (EP/P020267/1); Ministry of Education, Youth and Sports of the Czech Republic through the e-INFRA CZ (ID:90140).