['CC(C)C(=O)NCCNC=O', 'Cc1cccc(OCCN)c1', 'CC(C)C(=O)NCCN', 'Cc1cccc(OCCNC=O)c1', 'CC(C)C=O', 'Cc1cccc(OCCNC(=O)NCCN)c1', 'Cc1cccc(O)c1', 'CCNC(=O)NCCNC(=O)C(C)C', 'Cc1ccccc1', 'CC(C)C(=O)NCCNC(=O)NCCO', 'CCOc1cccc(C)c1', 'CC(C)C(=O)NCCNC(N)=O', 'CCNC(=O)C(C)C', 'Cc1cccc(OCCNC(N)=O)c1', 'CC(C)C(N)=O', 'CCNC(=O)NCCOc1cccc(C)c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.