['N#CCCNCCC#N', 'CCCNc1nnc(SCC=O)s1', 'CCC', 'N#CCCN(CCC#N)C(=O)CSc1nnc(N)s1', 'CCC#N', 'CCCNc1nnc(SCC(=O)NCCC#N)s1', 'CCCNc1nnc(S)s1', 'CC(=O)N(CCC#N)CCC#N', 'CCCN', 'N#CCCN(CCC#N)C(=O)CSc1nncs1', 'CCCNc1nncs1', 'N#CCCN(CCC#N)C(=O)CS']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1nncs1.