Using CCc1nc2c(cnn2CC)c(NC2CCOCC2)c1CN, CC(C)(C)OC(=O)OC(=O)OC(C)(C)C to produce CCc1nc2c(cnn2CC)c(NC2CCOCC2)c1CNC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.