Budesonide is a corticosteroid used for the treatment of asthma via various matrices and inhalation mechanisms. An unknown peak of Budesonide aqueous formulation has been investigated during stability study wherein the impurity level observed around 0.1% well below the threshold 0.5%. The approach to identify anonymous species was adopted as first to generate the impurity in sample, isolate, enrich and was subjected to LC-MS/MS and NMR for spectral studies. Based on the spectral data the

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... us species were identified as a "Lumibudesonide" ((5aR,5bS,5cS,6S,7aS,7bS, 10aR,11aS, 11bS)-6-hydroxy-7b-(2-hydroxyacetyl)-5b, 7a-dimethyl-9-propyl 1,5a,5b,5c, 6,7,7a, 7b, 10a,11, 11a,11b dodecahydrocyclopenta[2",3"]cyclopropa [1",2":3', 4']benzo [1',2':4,5]indeno [1,2-d][1,3]dioxol-5(2H)-one), which is observed in photolysis of Budesonide.