(Z)-2,3-二羟基-2-丙烯醛

2-[(2,4-dinitrophenyl)hydrazinylidene]propane-1,3-diol

1,3,4-trihydroxy-4-(4-nitrophenyl)butan-2-one

tert-butyl 4-hydroxy-3-(hydroxymethyl)but-2-enoate