Using C1COCCN1, CC(C)(C)OC(=O)N1CCOc2c(cccc2C(=O)O)C1 to produce CC(C)(C)OC(=O)N1CCOc2c(cccc2C(=O)N2CCOCC2)C1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.