Using COc1cccc2[nH]c(C(=O)NC3CCN(CCN4CCCCCC4)CC3)cc12 to produce O=C(NC1CCN(CCN2CCCCCC2)CC1)c1cc2c(O)cccc2[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.