Using CCc1nc2c(-c3ccc(C)cc3C)cc(C)nn2c1C(=O)OC to produce CCc1nc2c(-c3ccc(C)cc3C)cc(C)nn2c1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.