2-((R)-2-amino-2-phenylacetamido)-2-((2R,4S)-4-((((3,3-dimethyl-4,4-dioxido-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carbonyl)oxy)methoxy)carbonyl)-5,5-dimethylthiazolidin-2-yl)acetic acid
2-((R)-2-amino-2-phenylacetamido)-2-((2R,4S)-4-((((3,3-dimethyl-4,4-dioxido-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carbonyl)oxy)methoxy)carbonyl)-5,5-dimethylthiazolidin-2-yl)acetic acid