Using COCCBr, COC(=O)CCSc1cnc(Nc2nc([C@H]3COC4(CCCCC4)O3)ns2)c(Oc2c(C)nn(C)c2C)c1 to produce COCCSc1cnc(Nc2nc([C@H]3COC4(CCCCC4)O3)ns2)c(Oc2c(C)nn(C)c2C)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.