['CCCCC(CC)CN', 'O=Cc1ccc(N2NC(=O)CCC2=O)cc1', 'CCCCC(C)CC', 'NC(=O)c1ccc(N2NC(=O)CCC2=O)cc1', 'CCCCC(CC)CNC=O', 'O=C1CCC(=O)N(c2ccccc2)N1', 'O=C1CCC(=O)NN1', 'CCCCC(CC)CNC(=O)c1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1CCC(=O)N(c2ccccc2)N1.