we propose that macrolides may be classified into three groups , those forming complexes when given alone ( e.g. , erythromycin and troleandomycin ) , those forming complexes only in glucocorticoid-pretreated rats ( clarithromycin and roxithromycin ) and those not forming complexes ( josamycin , midecamycin and spiramycin ) .
C0014806
erythromycin
C0035891
roxithromycin