Using CCCCN1C=Nc2cccc3nc4c(c1c23)Cn1c-4cc2c(c1=O)COC(=O)[C@@]2(CC)OC(C)=O to produce CCCCN1C=Nc2cccc3nc4c(c1c23)Cn1c-4cc2c(c1=O)COC(=O)[C@]2(O)CC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.