(E)‐4‐(furan‐2‐yl)‐2‐oxobut‐3‐enoic acid

1,5-diphenyl-3-(4-methoxyphenyl)-verdazyl

1-(4-Nitro-phenyl)-3,5-diphenyl-verdazyl (?)

2-(p-methoxyphenyl)-4-phenyl-6-(p-nitrophenyl)-3,4-dihydro-2H-sym-tetrazin-1-yl