['CN', 'Cc1ccc(C)c(OCCCCC(=O)NNC=O)c1', 'Cc1ccc(C)c(O)c1', 'CCCCC(=O)NNC(=O)NC', 'Cc1ccc(C)cc1', 'CNC(=O)NNC(=O)CCCCO']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.