Using BrCCCBr, Nc1ncnc2c1nc(Sc1cc3c(cc1I)OCCO3)n2CCCBr to produce Nc1ncnc2c1nc(Sc1cc3c(cc1I)OCCO3)n2CCBr, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.