in this series , 6- [ ( r ) -2- [ 3- ( 3,4-dihydroxybenzoyl ) -3- ( 3-hydroxypropyl ) -1-ureido ] -2-phenylacetamido ] penicillanic acid ( 1b , ao-1100 ) showed the most potent protective effect on mice in experimental pseudomonas aeruginosa infections , although it did not have the strongest in vitro activity among the penicillins we synthesized .
C0030820
penicillanic acid
C0030842
penicillins