155346-68-2 3H-Thiazolo(3,4-a)pyrazine-5,8-dione, tetrahydro-6-phenyl-7-(phenylmethyl)- 6-Phenyl-7-benzylthiazolidino(3,4-a)piperazine-5,8-dione Tetrahydro-6-phenyl-7-(phenylmethyl)-3H-thiazolo(3,4-a)pyrazine-5,8-dione