Using O=C(COCc1ccccc1)Nc1c[nH]c2nccc(N3CCN(Cc4ccccc4)CC3)c12 to produce O=C(CO)Nc1c[nH]c2nccc(N3CCNCC3)c12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.