4-(butan-2-ylamino)pent-3-en-2-one

1,3,5,7-tetramethylpyrido[2,3-d]pyrimidine-2,4-dione

3-[(2,4,6-trimethylphenyl)methylidene]pentane-2,4-dione

(3,5-dimethyl-1,2-oxazol-4-yl)-(2-methylphenyl)diazene

(3,5-dimethyl-1,2-oxazol-4-yl)-(4-nitrophenyl)diazene