['CC=O', 'NCCCNC(=S)Nc1ccc2c(c1)OC(F)(F)O2', 'CC(N)=O', 'CCCNC(=S)Nc1ccc2c(c1)OC(F)(F)O2', 'CCCNC(C)=O', 'NC(=S)Nc1ccc2c(c1)OC(F)(F)O2', 'CC(=O)NCCCNC(N)=S', 'FC1(F)Oc2ccccc2O1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2c(c1)OCO2.