Using CCOC(=O)c1sc(-c2ccc(OCOC)c(-n3cnnn3)c2)nc1C to produce CCOC(=O)c1sc(-c2ccc(O)c(-n3cnnn3)c2)nc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.