Using O=C(O)c1cccc(C=c2c3ccccc3c3[nH]c(=O)c4nccn4c23)c1 to produce O=C(O)c1cccc(CC2c3ccccc3-c3[nH]c(=O)c4nccn4c32)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.