['COCCOCCN', 'O=Cc1cnc(Cl)c(Cl)c1', 'CO', 'CCOCCNC(=O)c1cnc(Cl)c(Cl)c1', 'CCOC', 'O=C(NCCO)c1cnc(Cl)c(Cl)c1', 'COCCO', 'CCNC(=O)c1cnc(Cl)c(Cl)c1', 'CCOCCOC', 'NC(=O)c1cnc(Cl)c(Cl)c1', 'Clc1cccnc1Cl', 'COCCOCCNC=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccncc1.