Using CCOCc1nc2c(N)nc3cc(/C=C/C(=O)OC)ccc3c2n1CC(C)(C)O to produce CCOCc1nc2c(N)nc3cc(CCC(=O)OC)ccc3c2n1CC(C)(C)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.