4-Thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid, 6-((((2-amino-2-carboxyethyl)thio)acetyl)amino)-3,3-dimethyl-7-oxo-, (2S-(2-alpha,5-alpha,6-beta(R *)))- 56448-19-2 Antibiotic rit-D 2214 RIT-D 2214 Rit 2214