Using CCn1ncc2c(NC3CCOCC3)c(C(=O)O)cnc21, CC(C)(C)OC(=O)NN to produce CCn1ncc2c(NC3CCOCC3)c(C(=O)NNC(=O)OC(C)(C)C)cnc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.