Using CC1(C)OB(c2cnn(CCN3CCOCC3)c2)OC1(C)C, OCc1cccc(-c2ncc(Br)cn2)c1 to produce OCc1cccc(-c2ncc(-c3cnn(CCN4CCOCC4)c3)cn2)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.