Using OCCCN1CCN(c2ncccn2)CC1, O=C(O)C12CC3CC(CC1C3)C2 to produce O=C(OCCCN1CCN(c2ncccn2)CC1)C12CC3CC(CC1C3)C2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.