Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 3,3-dimethyl-7-oxo-6-[(1-oxo-2,2-dipropylpentyl)amino]-, monosodium salt,[2S-(2a,5a,6b)]-; 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,6-(2,2-dipropylvaleramido)-3,3-dimethyl-7-oxo-, sodium salt (7CI); BRL 1201