Using Cc1c(CCc2ccc3nc(N)oc3c2)nc2cc(NC(=O)OC(C)(C)C)ccn12 to produce Cc1c(CCc2ccc3nc(N)oc3c2)nc2cc(N)ccn12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.