['CCCC(=O)O', 'Oc1ccc(N2CCNCC2)cc1', 'O=C(O)CCCO', 'c1ccc(N2CCNCC2)cc1', 'C1CNCCN1', 'O=C(O)CCCOc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(N2CCNCC2)cc1.