Using COCNC(=O)CCNC(=O)OC(C)(C)C, COc1cccc(Br)n1 to produce COc1cccc(C(=O)CCNC(=O)OC(C)(C)C)n1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.