5-Ethyl-5-(1-methylbutyl)-2-thiobarbituric acid 5-ethyl-5-(1-methylbutyl)-2-thioxodihydropyrimidine-4,6(1H,5H)-dione 71-73-8 (SODIUM SALT) 76-75-5 (FREE ACID) AIDS-018477 AIDS018477 Intraval Pentothiobarbital Thiomebumal Thionembutal Thiopental Thiopentobarbituric acid