Using CCn1ncc2c(-c3cncc(C)c3)c(CO)c(COC)nc21, CC(C)(C)OC(=O)CBr to produce CCn1ncc2c(-c3cncc(C)c3)c(COCC(=O)OC(C)(C)C)c(COC)nc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.