['COCCOCCN', 'O=Cc1ccc2cc[nH]c2c1', 'CO', 'CCOCCNC(=O)c1ccc2cc[nH]c2c1', 'CCOC', 'O=C(NCCO)c1ccc2cc[nH]c2c1', 'COCCO', 'CCNC(=O)c1ccc2cc[nH]c2c1', 'CCOCCOC', 'NC(=O)c1ccc2cc[nH]c2c1', 'c1ccc2[nH]ccc2c1', 'COCCOCCNC=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2[nH]ccc2c1.