Using CCc1nc2c(C)cc(C)nc2n1Cc1ccc(C2(C(=O)OC)CC=CC2)cc1 to produce CCc1nc2c(C)cc(C)nc2n1Cc1ccc(C2(C(=O)O)CC=CC2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.