Using CN1CCN(c2ccc3c(c2)CN(C2CCN(C(=O)OC(C)(C)C)CC2)C(=O)N3)CC1 to produce CN1CCN(c2ccc3c(c2)CN(C2CCNCC2)C(=O)N3)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.