['NC=O', 'C[C@@H](N)C(=O)NC1CCCCCC1', 'C[C@H](C=O)NC(N)=O', 'NC1CCCCCC1', 'NC(N)=O', 'CCC(=O)NC1CCCCCC1', 'C1CCCCCC1', 'C[C@@H](NC(N)=O)C(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCCCCC1.