Crystal structures of three indole derivatives: 3-ethnyl-2-methyl-1-phenylsulfonyl-1<i>H</i>-indole, 4-phenylsulfonyl-3<i>H</i>,4<i>H</i>-cyclopenta[<i>b</i>]indol-1(2<i>H</i>)-one and 1-{2-[(<i>E</i>)-2-(5-chloro-2-nitrophenyl)ethenyl]-1-phenylsulfonyl-1<i>H</i>-indol-3-yl}ethan-1-one chloroform monosolvate
Acta crystallographica. Section E, Crystallographic communications