Crystal structure and Hirshfeld surface analysis of 7,7-dimethyl-2-phenyl-3,3a,4,6,7,8,9,9a-octahydro-1<i>H</i>-benzo[<i>f</i>]isoindole-1,5(2<i>H</i>)-dione
Acta crystallographica. Section E, Crystallographic communications