['NC(=O)NCCC=O', 'C[C@H](O)C(=O)N1CCCc2ccccc21', 'NC=O', 'C[C@H](OC(=O)CCN)C(=O)N1CCCc2ccccc21', 'c1ccc2c(c1)CCCN2', 'C[C@@H](C=O)OC(=O)CCNC(N)=O', 'NC(=O)NCCC(=O)O', 'CCC(=O)N1CCCc2ccccc21', 'NC(N)=O', 'CCC(=O)O[C@@H](C)C(=O)N1CCCc2ccccc21']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2c(c1)CCCN2.