N-Desacetyl O4-desmethyl O3-desethyl apremilast

4-Amino-2-[(1S)-1-(3,4-dihydroxyphenyl)-2-(methylsulfonyl)ethyl]-1H-Isoindole-1,3(2H)-dione;
(S)-4-amino-2-(1-(3,4-dihydroxyphenyl)-2-(methylsulfonyl)ethyl)isoindoline-1,3-dione;