an intermediate spectrum macrolide antibiotic C??H??NO?? produced by Streptomyces erythreus, occurring as a slightly yellow, crystalline powder, effective against most gram-positive and certain gram-negative bacteria, such as Neisseria and Hemophilus influenzae, and against spirochetes, some rickettsias, and Entamoeba, and highly effective against Mycoplasma pneumoniae, kiirikseentest saadav antibiootikum. E. toimib stafülo-, strepto-, gono- ja meningokokkidesse, difteeria- ja teetanusetekitajaisse ning mõningaisse teistesse mikroorganismidesse.