['CC(C)(C)O', 'Cc1cc2ccccc2n1CCNC=O', 'CC(C)(C)OC=O', 'Cc1cc2ccccc2n1CCN', 'CC(C)C', 'Cc1cc2ccccc2n1CCNC(=O)O', 'CC(C)(C)OC(N)=O', 'CCn1c(C)cc2ccccc21', 'CCNC(=O)OC(C)(C)C', 'Cc1cc2ccccc2[nH]1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2[nH]ccc2c1.