['CCC(C)(C)N', 'Cc1csc(N2CCCN(CC=O)CC2)n1', 'CCC(C)C', 'Cc1csc(N2CCCN(CC(N)=O)CC2)n1', 'CCC(C)(C)NC(C)=O', 'Cc1csc(N2CCCNCC2)n1', 'Cc1cscn1', 'CCC(C)(C)NC(=O)CN1CCCNCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1csc(N2CCCNCC2)n1.