['COCCN', 'CC(C)c1nn(C)cc1CNCCC=O', 'CO', 'CCNC(=O)CCNCc1cn(C)nc1C(C)C', 'CCOC', 'CC(C)c1nn(C)cc1CNCCC(N)=O', 'CCC(=O)NCCOC', 'CC(C)c1nn(C)cc1CN', 'Cc1cn(C)nc1C(C)C', 'COCCNC(=O)CCN', 'CCC', 'COCCNC(=O)CCNCc1cnn(C)c1', 'CC(C)c1ccn(C)n1', 'CNCCC(=O)NCCOC']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cn[nH]c1.