The enrichment of privileged edges to produce high CO2 working capacity is also less significant than for the CH4 case. Edge 8 (E8, CSD refcode: KIFKEQ), derived from biphenyl-4,4dicarboxylic acid, appears 8 times among the top 20 MOFs, and this edge is also the most frequently appearing edge in USMOF DB (145 out of 1,102, Supporting Information Figure ).