Atorvastatin Diamino Impurity

Tert-butyl 2-((4R,6R)-6-(2-(2-((4R,6R)-6-(2-(2-(4-fluorophenyl)-5-isopropyl-3-phenyl-4-(phenylcarbamoyl)-1H-pyrrol-1-yl)ethyl)-2,2-dimethyl-1,3-dioxan-4-yl)acetamido)ethyl)-2,2-dimethyl-1,3-dioxan-4-yl)acetate; Atorvastatin Di-acetonide tert-Butyl Ester; ((4R,6R)-6-{2-[2-((4R,6R)-6-{2-[2-(4-fluoro-phenyl)-5-isopropyl-3-phenyl-4-phenylcarbamoyl-pyrrol-1-yl]-ethyl}-2,2-dimethyl-[1,3]dioxan-4-yl)-acetylamino]-ethyl}-2,2-dimethyl-[1,3]dioxan-4-yl)-acetic acid tert-butyl ester}