(2S,5R,6R)-3,3-Dimethyl-7-oxo-6-[(phenoxyacetyl)amino]-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 132-98-9 (POTASSIUM) 87-08-1 (FREE ACID) AIDS-184447 AIDS184447 Beromycin Penicillin V