Using COC(=O)CCN1CCC(c2c(-c3ccccc3)nn3ccccc23)=CC1=O to produce O=C(O)CCN1CCC(c2c(-c3ccccc3)nn3ccccc23)=CC1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.