['CNC(=O)[C@H](C)O', 'O=Cc1c2c(nc3ccccc13)CCCCC2', 'CN', 'C[C@@H](C=O)OC(=O)c1c2c(nc3ccccc13)CCCCC2', 'CCC(=O)NC', 'O=C(O)c1c2c(nc3ccccc13)CCCCC2', 'CNC(=O)[C@H](C)OC=O', 'c1ccc2nc3c(cc2c1)CCCCC3']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2nc3c(cc2c1)CCCCC3.