Using COC(=O)CCn1c(=O)n2n(c1=O)C(C(=O)O)C=CC2 to produce O=C(O)CCn1c(=O)n2n(c1=O)C(C(=O)O)C=CC2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.