2beta-(Chloromethyl)-2alpha-methylpenam-3alpha-carboxylic acid 1,1-dioxide 4-Thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid, 3-(chloromethyl)-3-methyl-7-oxo-, 4,4-dioxide, potassium salt, (2S-(2alpha,3beta,5alpha))- 79634-05-2 BL P2013 BL-P 2013 Potassium 2beta-(chloromethyl)-2alpha-methylpenam-3alpha-carboxylate 1,1-dioxide