[ studies on ampicillin and amoxicillin derivatives . iii . synthesis of 6- [ 2- [ ( pyrido [ 2,3-d ] pyrimidin-6-yl ) methylamino ] -2- phenylacetamido ] -penicillanic acid derivatives , 6- [ 2- ( 4-pyrimidinylamino ) -2-phenylacetamido ] penicillanic acid derivatives and -cephalosporanic acid derivatives ] .
C0002680
ampicillin
C0002645
amoxicillin