Synonyms: n-[(5r,6r)-3,7-dioxo-2-(propan-2-ylidene)-4-thia-1-azabicyclo[3.2.0]hept-6-yl]-2-phenoxyacetamide;Phenoxymethylanhydropenicillin;AC1L4RWH;AC1Q6NW3;47295-33-0;AR-1K3198;Acetamide, N-(2-(1-methylethylidene)-3,7-dioxo-4-thia-1-azabicyclo(3.2.0)hept-6-yl)-2-phenoxy-, (5R-trans)-;N-[(5R,6R)-3,7-dioxo-2-propan-2-ylidene-4-thia-1-azabicyclo[3.2.0]heptan-6-yl]-2-phenoxyacetamide