['CNC(=O)[C@@H](C)O', 'O=CCCCNC(=O)c1ccc(Cl)cc1', 'CN', 'C[C@H](C=O)OC(=O)CCCNC(=O)c1ccc(Cl)cc1', 'O=Cc1ccc(Cl)cc1', 'CNC(=O)[C@@H](C)OC(=O)CCCN', 'CCC(=O)NC', 'O=C(O)CCCNC(=O)c1ccc(Cl)cc1', 'NC(=O)c1ccc(Cl)cc1', 'CCCC(=O)O[C@H](C)C(=O)NC', 'Clc1ccccc1', 'CNC(=O)[C@@H](C)OC(=O)CCCNC=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.