Zometapine (CI-781) is an antidepressant drug which is a pyrazolodiazepine derivative. Its molecular structure closely resembles benzodiazepines and is unrelated to other antidepressant drug classes. DeWald H. A.; Lobbenstael S. J.; 1974 U.S. Patent 3823157.As can be seen the product is capable of tautomerizing.
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