Using CCCn1c(N)c(N)c(=O)[nH]c1=O, O=C(O)C1CCCC1 to produce CCCn1c(=O)[nH]c(=O)c2[nH]c(C3CCCC3)nc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.