Using COCCOCCOc1cc2ncn(COC(=O)C(C)(C)C)c(=O)c2cc1OC to produce COCCOCCOc1cc2nc[nH]c(=O)c2cc1OC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.