Apremilast N-formyl impurity

Chemical Name: N-[2-[(1S)-1-(3-Ethoxy-4-methoxyphenyl)-2-(methylsulfonyl)ethyl]-2,3-dihydro-1,3-dioxo-1H-isoindol-4-yl]-formamide

Synonym: N-Desacetyl-N-formyl Apremilast ;