Finasteride Impurity - C

N-(1,1-Dimethylethyl)-3-oxo-4-azaandrosta-1,5-diene-17β-carboxamide; (4aR,4bS,6aS,7S,9aS,9bS)-N-(tert-butyl)-4a,
6a-dimethyl-2-oxo-2,4a,4b,5,6,6a,7,8,9,9a,9b,10-dodecahydro-1H-indeno[5,4-f]quinoline-7-carboxamide; 1H-Indeno[5,4-f]quinoline-7-carboxamide, N-(1,1-dimethylethyl)-2,4a,4b,5,6,6a,7,8,9,9a,9b,10-dodecahydro-4a,6a-dimethyl-2-oxo-, (4aR,4bS,6aS,7S,9aS,9bS); 5,6-Dehydro Finasteride