Using CC(=O)O, CCOC(=O)c1cc2c(nc1C(=O)OCC)CCCC2 to produce CCOC(=O)c1cc2c(nc1C(=O)OCC)C(OC(C)=O)CCC2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.