Azithromycin CAS No. : [83905-01-5] Spec : USP Supply : Commercial Name AzithromycinSynonyms 9-Deoxo-9a-methyl ... ethyl-3,4,10-trihydroxy-13-[(2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyloxan-2-yl]oxy-3 ... ,5,6,8,10,12,14-heptamethyl-1-oxa-6- ... Molecular Formula C38H72N2O12Molecular Weight 748.99CAS Registry Number 83905-01-5Melting point 113-115 ºC Azithromycin