['CCNCC', 'Cc1noc(C)c1CNC=O', 'CCN(C=O)CC', 'Cc1noc(C)c1CN', 'CC', 'CCNC(=O)NCc1c(C)noc1C', 'Cc1noc(C)c1C', 'CCN(CC)C(N)=O', 'Cc1cc(C)on1', 'CCN(CC)C(=O)NC']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cnoc1.