['CC(C)(C)O', 'Cc1noc(C)c1CNC(=O)CCCNC=O', 'Cc1noc(C)c1CN', 'CC(C)(C)OC(=O)NCCCC=O', 'CC(C)(C)OC=O', 'Cc1noc(C)c1CNC(=O)CCCN', 'CC(C)C', 'Cc1noc(C)c1CNC(=O)CCCNC(=O)O', 'Cc1noc(C)c1C', 'CC(C)(C)OC(=O)NCCCC(N)=O', 'CC(C)(C)OC(N)=O', 'CCCC(=O)NCc1c(C)noc1C', 'Cc1cc(C)on1', 'CNC(=O)CCCNC(=O)OC(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cnoc1.