Mometasone EP Impurity B

Chemical Name: 9-Chloro-17β-(2,2-dioxo-2,5-dihydro-1,2λ6-oxathiol-4-yl)-11β-hydroxy-16α-methyl-3-oxoandrosta-1,4-dien-17α-yl furan-2-carboxylate (as per EP)

Synonym: 7-(3-(1,1-difluoropentyl)-3-hydroxy-4-oxo-1,2,3,3a,4,6a-hexahydropentalen-3a-yl)heptanoic acid