Using COC(=O)c1cc(Br)ccn1, Nc1ccc2c(c1)CC1(C2)C(=O)Nc2ncccc21 to produce O=C(O)c1cc(Nc2ccc3c(c2)CC2(C3)C(=O)Nc3ncccc32)ccn1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.