['CCO', 'Cc1cc(C)c(OCC=O)c(C)c1', 'CC', 'Cc1cc(C)c(OCC(=O)O)c(C)c1', 'CCOC(C)=O', 'Cc1cc(C)c(O)c(C)c1', 'CCOC(=O)CO', 'Cc1cc(C)cc(C)c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.