Synonyms: 4,6(1H,5H)-Pyrimidinedione, 5-ethyldihydro-5-(1-methylbutyl)-2-thioxo-, monosodium salt, (S)-;4,6(1H,5H)-Pyrimidinedione, 5-ethyldihydro-5-[(1S)-1-methylbutyl]-2-thioxo-, monosodium salt (9CI);S-(-)-Thiopental sodium;(-)-5-Ethyl-5-[(S)-1-methylbutyl]-2-sodiothio-4,6(1H,5H)-pyrimidinedione