['CCCCCC(C)N', 'O=CCSc1nnc(N2CCOCC2)s1', 'CCCCCCC', 'NC(=O)CSc1nnc(N2CCOCC2)s1', 'CCCCCC(C)NC(C)=O', 'Sc1nnc(N2CCOCC2)s1', 'C1COCCN1', 'CCCCCC(C)NC(=O)CSc1nncs1', 'c1nnc(N2CCOCC2)s1', 'CCCCCC(C)NC(=O)CS']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1nnc(N2CCOCC2)s1.