Using COc1cc(OC)nc(Oc2cccc(Oc3nc(OC)cc(OC)n3)c2C(=O)O)n1, COCCl to produce COCOC(=O)c1c(Oc2nc(OC)cc(OC)n2)cccc1Oc1nc(OC)cc(OC)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.