3H-Thiazolo(3,4-a)pyrazine-5,8-dione, tetrahydro-7-phenyl- 7-Phenylthiazolidino(3,4-a)piperazine-5,8-dione 95110-37-5 Tetrahydro-7-phenyl-3H-thiazolo(3,4-a)pyrazine-5,8-dione