1H-Pyrrolo(1,2-a)imidazole-2,5(3H,6H)-dione, dihydro-3,7a-dimethyl-, (S)- Dihydro-3,7a-dimethyl-1H-pyrrolo(1,2-a)imidazole-2,5(3H,6H)-dione (S)- UY8581593