Using Cc1csc(Nc2cc(Oc3cccc(O)c3)ccn2)n1, CC(C)(C)OC(=O)CBr to produce Cc1csc(Nc2cc(Oc3cccc(OCC(=O)OC(C)(C)C)c3)ccn2)n1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.