Using CCOC(=O)CC1Cc2ccc(CCCc3nc4ccccc4[nH]3)cc2Cc2ccccc21 to produce O=C(O)CC1Cc2ccc(CCCc3nc4ccccc4[nH]3)cc2Cc2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.