Erythromycin Stearate CAS No.：643-22-1 Molecular Formula: C55H103NO15 Molecular Weight: 1018.4 Properties: Fine white powder, stable. Combustible, incompatible with acids, strong oxidizing agents Uses: API (Antibiotic medicine, used for staph infections caused by penicillin resistance) Packing: 25 kg/drum or packaged based on the customer's request. Storage: Preserve in tight container and in cool air. Test items Specifications Water ≤4.0% Residue on ignition ≤1.0% Any individual related substances ≤3.0% Erythromycin A enol ether ≤3.0% Pseudoerythromycin A enol ether ≤3.0% Assay(Erythromycin A.B C) ≥55.0% Erythromycin B ≤12.0% Erythromycin C ≤5.0%