['CC(C)C=O', 'Cc1nn(CCO)c(C)c1CNCCN', 'CC(C)C(=O)NCCN', 'Cc1nn(CCO)c(C)c1C', 'CCNC(=O)C(C)C', 'Cc1nn(CCO)c(C)c1CN', 'CC(C)C(N)=O', 'CCNCc1c(C)nn(CCO)c1C', 'CCO', 'Cc1n[nH]c(C)c1CNCCNC(=O)C(C)C', 'CNCCNC(=O)C(C)C', 'Cc1cc(C)n(CCO)n1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cn[nH]c1.