2-[carboxy({[3-(2-chlorophenyl)-5-methylisoxazol-4-yl]carbonyl}amino)methyl]-3-{[6-({[3-(2-chlorophenyl)-5-methylisoxazol-4-yl]carbonyl}amino)-2,2-dimethyl-5-oxo-3,5,6,6a-tetrahydro-2H-azeto[2,1-b][1,3]thiazol-3-yl]carbonyl}-5,5-dimethyl-1,3-thiazolidine-4-carboxylic acid