['COCCOCCC=O', 'Cc1cc(C)c(CN)c(C)c1', 'CO', 'CCOCCC(=O)NCc1c(C)cc(C)cc1C', 'CCOC', 'Cc1cc(C)c(CNC(=O)CCO)c(C)c1', 'COCCO', 'CCC(=O)NCc1c(C)cc(C)cc1C', 'Cc1cc(C)c(C)c(C)c1', 'COCCOCCC(N)=O', 'Cc1cc(C)cc(C)c1', 'CNC(=O)CCOCCOC']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.