Using CCCN(CCCN(CCCN(CCC1CCCCN1)C(=O)OC(C)(C)C)C(=O)OC(C)(C)C)C(=O)OC(C)(C)C to produce CCCNCCCNCCCNCCC1CCCCN1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.