the antibacterial efficacy of erythromycin stearate ( es ) and a new erythromycin prodrug , erythromycin acistrate ( ea , 2'-acetyl erythromycin stearate ) , was compared in two staphylococcus aureus strains , one sensitive and the other resistant to erythromycin .
C0059566
erythromycin stearate
C0014806
erythromycin