Using O=C(CN1CCNCC1)N1CCOCC1, O=C(O)CN1CCCC1=O to produce O=C(CN1CCN(C(=O)CN2CCCC2=O)CC1)N1CCOCC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.