Synonyms: Totocillin;Diamplicil;HI 56;4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,6-[[(2R)-aminophenylacetyl]amino]-3,3- dimethyl-7-oxo-,(2S,5R,6R)-,mixt. with (2S,5R,6R)-6-[[[3-(2,6-dichlorophenyl)-5- methyl-4-isoxazolyl]carbonyl]amino]-3,3- dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]- heptane-2-carboxylic acid;