SPL Set ID: 06a4ee22-d8f8-4a8a-8666-82b14f2d8476

Mupirocin Ointment USP, 2% contains the RNA synthetase inhibitor antibacterial, mupirocin, USP. The chemical name is ( E )-(2 S ,3 R ,4 R ,5 S )-5-[(2 S ,3 S ,4 S ,5 S )-2,3-epoxy-5-hydroxy-4-methylhexyl]tetrahydro-3,4dihydroxy-β-methyl-2 H -pyran-2-crotonic acid, ester with 9-hydroxynonanoic acid. The molecular formula of mupirocin, USP is C 26 H 44 O 9 , and the molecular weight is 500.6 g/mol. The structural formula of mupirocin, USP is: Figure 1. Structure of Mupirocin, USP Each gram of Mupirocin Ointment USP, 2% contains 20 mg mupirocin, USP in a water-miscible ointment base (polyethylene glycol ointment, N.F.) consisting of polyethylene glycol 400 and polyethylene glycol 3350. Structure