ErythromycinErythromycin 
CAS No: 114-07-8 
Molecular Formula: C37H67NO13 
Formula Weight: 733.93 
usage: Erythromycin is a macrolide antibiotic that has an antimicrobial spectrum similar to or slightly wider than that of penicillin, and is often used for people who have an allergy to penicillins.