Using O=C(O)c1ccc2c(c1)OCO2, CCCCCCCCc1cnc(-c2ccc(O)cc2)nc1 to produce CCCCCCCCc1cnc(-c2ccc(OC(=O)c3ccc4c(c3)OCO4)cc2)nc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.