Towards large-scale calculations with State-Specific Multireference Coupled Cluster methods: Studies on dodecane, naphthynes, and polycarbenes

► We investigate the potential of MRCC for studying molecules of non-trivial sizes. ► We find that MRCC is successful for dodecane, naphthynes, and polycarbenes. ► We find that MRCC successfully deals with near degeneracies in bond breaking. ► We find that MRCC successfully deals with near degeneracies in radical systems.