Using CC(=O)OC(C)=O, CCCn1c(COCC)nc2c(N)nc3cc(OC4CCNCC4)ccc3c21 to produce CCCn1c(COCC)nc2c(N)nc3cc(OC4CCN(C(C)=O)CC4)ccc3c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.