15-Crown-5
18-Crown-6
2,3-Butanedione Monoxime
2-Amino-3,5-dibromobenzaldehyde
2-Mercapto-5-nitrobenzimidazole
3,4-Dihydroxybenzaldehyde
4-Dimethylaminobenzaldehyde
4-Hydroxycoumarin
6-Bromo-1-hexanol
Aminopyrazine
Benzo-15-crown-5
Benzo-18-crown-6