CAS 119665-78-0 appears in our catalog under these names: Erythromycin Impurity 8, Erythromycin Impurity 59, 2’,4’’-O-Bis(trimethylsilyl)erythromycin A 9-O-(1-Ethoxy-1-methylethyl)oxime, 2′,4′′-Bis-O-(trimethylsilyl)-erythromycin 9-(O-(1-ethoxy-1-methylethyl)oxime). Offered by: Chemat Brand, TRC, Biosynth. Available pack sizes: on request, 100mg, 10mg, 25mg, 5mg.