['CCCNC(=O)CO', 'Cc1cccc2nc(C=O)cn12', 'CCCN', 'Cc1cccc2nc(C(=O)OCC=O)cn12', 'CCCNC(C)=O', 'Cc1cccc2nc(C(=O)O)cn12', 'CCC', 'Cc1cccc2nc(C(=O)OCC(N)=O)cn12', 'CCCNC(=O)COC=O', 'Cc1cccc2nccn12']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccn2ccnc2c1.