Using CSC1=NCCN1, CC(=O)OCCn1c(=O)oc(=O)c2ccccc21 to produce CC(=O)OCCN1C2=NCCN2C(=O)c2ccccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.