Using CC(C)(C)OC(=O)NCCN(CCOC(=O)c1cccc(N2C(=O)C=CC2=O)c1)C(=O)OC(C)(C)C to produce NCCNCCOC(=O)c1cccc(N2C(=O)C=CC2=O)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.