(2S, 5R, 6R) -3, 3- dimethyl- 6- [[(5- methyl- 3- phenyl- 4- isoxazolyl) carbonyl] amino] - 7- oxo- 4- Thia- 1- azabicyclo[3.2.0] heptane- 2- carboxylic acid
(2S, 5R, 6R) -3, 3- dimethyl- 6- [[(5- methyl- 3- phenyl- 4- isoxazolyl) carbonyl] amino] - 7- oxo- 4- Thia- 1- azabicyclo[3.2.0] heptane- 2- carboxylic acid