Using O=C1COCC(=O)NC(COCc2ccccc2)CNCC(COCc2ccccc2)N1 to produce c1ccc(COCC2CNCC(COCc3ccccc3)NCCOCCN2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.