Using CCSSCC, Cc1nc2c(cc1Br)C[C@@H]1CN(C(=O)OC(C)(C)C)C[C@@H](C)N21 to produce CCSc1cc2c(nc1C)N1[C@H](C2)CN(C(=O)OC(C)(C)C)C[C@H]1C, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.