['CC=O', 'NCCNCc1cc(Cl)c2c(c1)OCCCO2', 'CC(N)=O', 'CCNCc1cc(Cl)c2c(c1)OCCCO2', 'CCNC(C)=O', 'NCc1cc(Cl)c2c(c1)OCCCO2', 'CC(=O)NCCN', 'Cc1cc(Cl)c2c(c1)OCCCO2', 'CNCCNC(C)=O', 'Clc1cccc2c1OCCCO2']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2c(c1)OCCCO2.