6- and 4-Substituted-1-azabicyclo[3.2.0]heptan-3,7-dione-2-carbo

6-(1'-Cyclohexenylglycinamido)penicillanic acid and salts thereo

6-(1'-Hydroxyethyl)-2-substituted-pen-2-em-3-carboxylic acid

6-(1,3-Dithiolan-2-imino)penicillanic acid derivatives

6-(1-hydroxyethyl)-2-(2-amin oethylthio)-1,1-disubstituted-1-car

6-(2,3-Dihydro-5-benzofuranyl)acetamido penicillin derivatives

6-(2-Aryl-2-(1,1-dioxopenicillanoyloxy-methoxycarbonyl)acetamido

6-(3,4-Methylenedioxy-6-benzylalkylaminoethylphenylacetyl)benzoi

6-(3-Cyanopropyl)-2-vinyl tetrahydropyran-2-ol and its tautomer

6-(3-Substituted amino-2-hydroxypropoxyaryl)-4,5-dihydro-3(2H)-p

6-(Aminated methyl)-3.beta.-oxy-5.alpha.-(cholestane-stigmastane

6-(Bromomethyl)-2,4-diaminopteridine hydrobromide

6-(D-.alpha.-Amino-p-hydroxyphenylacetamido)-penicillanic acid p

6-(O-Halophenyl)-1-methyl-4H-s-triazolo[4,3-a][1,4]-benzodiazepi

6-(Or 8)-[[(substituted amino)alkyl]oxy(or thio)]-3,4-dihydro-4-

6-(Substituted-cycloalkylcarboxamide) penicillanic acids

6-(Substituted-hydroxymethylene penams)

6-(Trifluoromethyl)-benzothiadiazines

6-.beta.-Substituted penicillanic acids as .beta.-lactamase inhi

6-Acyl derivatives of aminopenicillanic acid