(2S,5R,6R)-6-({[3-(2,6-dichlorophenyl)-5-methyl-1,2-oxazol-4-yl]carbonyl}amino)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
3-(2,6-Dichlorophenyl)-5-methyl-4-isoxazolylpenicillin