Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 3,3-dimethyl-7-oxo-6-(2-phenoxyacetamido)-, calcium salt (2:1) (8CI);4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,3,3-dimethyl-7-oxo-6-[(phenoxyacetyl)amino]-, calcium salt (2:1), [2S-(2a,5a,6b)]-; Bantogen; Calciopen; Calcipen V; Calcium penicillin V; Calciumphenoxymethylpenicillin; Penavlon-V; Penicillin V calcium;Phenoxymethylpenicillin calcium; Stabilin-V