['COCCOCCC=O', 'NC1CCSc2ccc(Cl)cc21', 'CO', 'CCOCCC(=O)NC1CCSc2ccc(Cl)cc21', 'CCOC', 'O=C(CCO)NC1CCSc2ccc(Cl)cc21', 'COCCO', 'CCC(=O)NC1CCSc2ccc(Cl)cc21']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2c(c1)CCCS2.