Using CO, CCCn1c(=O)c2nc(C(CC)c3ccc(SCC(=O)O)cc3)[nH]c2n(CCC)c1=O to produce CCCn1c(=O)c2nc(C(CC)c3ccc(SCC(=O)OC)cc3)[nH]c2n(CCC)c1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.