['CCCCCCCCC=O', 'COc1cccc(OC)c1OCC(O)CN', 'COc1cccc(OC)c1O', 'CCCCCCCCC(=O)NCC(C)O', 'COc1cccc(OC)c1', 'CCCCCCCCC(=O)NCC(O)CO', 'CO', 'CCCCCCCCC(=O)NCC(O)COc1ccccc1OC', 'CCCCCCCCC(N)=O', 'COc1cccc(OC)c1OCC(C)O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.