the in vitro activity of dirithromycin ( ly-237216 ) , a new macrolide erythromycin derivative , was compared to that of four other agents ( clarithromycin , erythromycin , roxithromycin , clindamycin ) against 334 gram-positive isolates obtained from cancer patients .
C0055856
clarithromycin
C0014806
erythromycin