preferred_name: (2S,5R,6R)-6-((2S,5R,6R)-6-(3-(2-CHLOROPHENYL)-5-METHYLISOXAZOLE-4-CARBOXAMIDO)-3,3-DIMETHYL-7-OXO-4-THIA-1-AZABICYCLO(3.2.0)HEPTANE-2-CARBOXAMIDO)-3,3-DIMETHYL-7-OXO-4-THIA-1-AZABICYCLO(3.2.0)HEPTANE-2-CARBOXYLIC ACID