Using O=C(Nc1nc(-c2ccco2)c(C(=O)C2CCOCC2)s1)c1ccnc(CCl)c1, CO to produce COCc1cc(C(=O)Nc2nc(-c3ccco3)c(C(=O)C3CCOCC3)s2)ccn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.