['COCCOCCN', 'O=Cc1cccc2cn[nH]c12', 'CO', 'CCOCCNC(=O)c1cccc2cn[nH]c12', 'CCOC', 'O=C(NCCO)c1cccc2cn[nH]c12', 'COCCO', 'CCNC(=O)c1cccc2cn[nH]c12', 'CCOCCOC', 'NC(=O)c1cccc2cn[nH]c12', 'c1ccc2[nH]ncc2c1', 'COCCOCCNC=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2[nH]ncc2c1.