7950
All the 11 , 4 '' - disubstituted analogs exhibited excellent activity ( 0 . 03 - 0 . 12 mu g / ml ) against erythromycin - susceptible Streptococcus pneumoniae , and significantly improved activity against three phenotypes of erythromycin - resistant S . pneumoniae compared with erythromycin A , clarithromycin or azithromycin .
 Chemical: erythromycin; Chemical: erythromycin; Chemical: erythromycin A; Chemical: clarithromycin; Chemical: azithromycin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: erythromycin; Chemical: erythromycin; Chemical: erythromycin A; Chemical: clarithromycin; Chemical: azithromycin