['Cc1ccco1', 'Nc1ncc(/C=C/C(=O)O)cn1', 'NCc1ccco1', 'O=C(O)/C=C/c1cncnc1', 'CC(=O)O', 'Cc1cnc(NCc2ccco2)nc1', 'c1ccoc1', 'CNc1ncc(/C=C/C(=O)O)cn1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cnc(NCc2ccco2)nc1.