CAS No.: 7177-48-2 molecular weight: 403.45 Synonyms: trihydrate, d- (-)-do)-3-dimethyl-7-oxo- alpha-aminobenzylpenicillin trihydrate 6-(2-amino-2-phenylacetamido)-3,3-dimethyl-7-oxo-,trihydrate,d-(-)-4-thia-1-azabicyclo(3.2.0) heptae-2-carboxylic aci Formula: 403.45