['CC(C)N(C(=O)[C@H](C)O)C(C)C', 'Cc1nc2c(cnn2C(C)C)cc1C=O', 'CC(C)NC(C)C', 'Cc1nc2c(cnn2C(C)C)cc1C(=O)O[C@@H](C)C=O', 'CCC(=O)N(C(C)C)C(C)C', 'Cc1nc2c(cnn2C(C)C)cc1C(=O)O', 'CCC', 'Cc1nc2c(cnn2C(C)C)cc1C(=O)O[C@@H](C)C(=O)NC(C)C', 'Cc1ccc2cnn(C(C)C)c2n1', 'CC(C)N(C(=O)[C@H](C)OC=O)C(C)C', 'CCC', 'Cc1nc2[nH]ncc2cc1C(=O)O[C@@H](C)C(=O)N(C(C)C)C(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cnc2[nH]ncc2c1.