['COCCOCC=O', 'CC(C)[C@@H](N)c1ccc2c(c1)OCCO2', 'CO', 'CCOCC(=O)N[C@@H](c1ccc2c(c1)OCCO2)C(C)C', 'CCOC', 'CC(C)[C@@H](NC(=O)CO)c1ccc2c(c1)OCCO2', 'COCCO', 'CC(=O)N[C@@H](c1ccc2c(c1)OCCO2)C(C)C', 'COCCOCC(N)=O', 'CC(C)Cc1ccc2c(c1)OCCO2', 'c1ccc2c(c1)OCCO2', 'COCCOCC(=O)NCC(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2c(c1)OCCO2.