['CCCO', 'NCc1ccc(-c2nc3ccccc3s2)o1', 'C[C@@H](N)CO', 'Cc1ccc(-c2nc3ccccc3s2)o1', 'CN[C@H](C)CO', 'c1coc(-c2nc3ccccc3s2)c1', 'c1ccc2scnc2c1', 'C[C@H](CO)NCc1ccco1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1coc(-c2nc3ccccc3s2)c1.