Using COc1cc2c(c(Cl)c1O)c(=O)c(C(=O)O)cn2C1CC1 to produce O=C(O)c1cn(C2CC2)c2cc(O)c(O)c(Cl)c2c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.