Budesonide Impurity 131

2- ((6aR,6bS,7S,8aS,8bS,10R,11aR,12aS,12bS) -10-cyclohexyl-7-hydroxy-6a,8a-dimethyl-4-oxo-1,2,4,6a,6b,7,8,8a,11a,12,12a,12b-dodecahydro-8bH-naphtho[2',1':4,5]indeno[1,2-d][1,3]dioxol-8b-yl) -2-oxoethyl cyclohexanecarboxylate