Using O=C(O)CO, CNCCOc1cccc2ncnc(Nc3ccc(Oc4ccc(C)nc4)c(C)c3)c12 to produce Cc1ccc(Oc2ccc(Nc3ncnc4cccc(OCCN(C)C(=O)CO)c34)cc2C)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.