Using O=C1CN(C(=O)OCc2ccccc2)CCN1, NOP(=O)(c1ccccc1)c1ccccc1 to produce NN1CCN(C(=O)OCc2ccccc2)CC1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.