7-chloro-2,3-dihydro-2-(hydroxymethyl)-5-nitro-6-benzofurancarboxaldehyde

(8-chloro-3,5-dihydro-2H-furo[2,3-f]indol-2-yl)methyl acetate

2-(acetoxymethyl)-7-chloro-2,3-dihydro-5-nitro-6-(β-nitrovinyl)benzofuran