Using COCC1CN(c2ncccn2)CC2(CCN(C(=O)OC(C)(C)C)CC2)O1 to produce COCC1CN(c2ncccn2)CC2(CCNCC2)O1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.