Using O=C(c1cn(C(c2ccccc2)(c2ccccc2)c2ccccc2)cn1)c1cccc2nsnc12 to produce c1cc(Cc2c[nH]cn2)c2nsnc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.