['CN', 'C[C@H]1[C@H](C)CCC[C@H]1n1c(S[C@@H](C)C=O)nc2ccccc2c1=O', 'CCC(=O)NC', 'C[C@H]1[C@H](C)CCC[C@H]1n1c(S)nc2ccccc2c1=O', 'C[C@@H]1CCCC[C@H]1C', 'CNC(=O)[C@H](C)Sc1nc2ccccc2c(=O)[nH]1', 'CNC(=O)[C@H](C)S', 'C[C@H]1[C@H](C)CCC[C@H]1n1cnc2ccccc2c1=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=c1c2ccccc2ncn1C1CCCCC1.