['CCC(C)(C)N', 'O=CCOc1cc2c(cc1C=O)OCO2', 'CCC(C)(C)NC(C)=O', 'O=Cc1cc2c(cc1O)OCO2', 'CCC(C)(C)NC(=O)CO', 'O=Cc1ccc2c(c1)OCO2', 'CCC(C)C', 'NC(=O)COc1cc2c(cc1C=O)OCO2']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2c(c1)OCO2.