Fluticasone USP RC B

Chemical Name: Fluticasone USP Related Compound B ; Fluticasone Trioxo Impurity ; 6alpha,9alpha-Difluoro-11beta-hydroxy-16alpha-methyl-2',3,4'-trioxo-17alpha-spiro(androsta-1,4-diene-17,5'-(1,3)oxathiolane) ;