4-羟基苯甲酸

4-hydroxy-4-methyl-2-pentanone

4-hydroxy-2-methyl-pentanal

hydroxy-L-proline; 4-hydroxy-2-pyrrolidine-carboxylic acid

4-hydroxy-3-methoxy-cinnamic alcohol

4-hydroxy-3-methoxy benzyl alcohol

4 HYDROXY N-METHYL-2- QUINOLONE

2-Hydroxy-1,4-naphthoquinone (Lawsone).

4-hydroxy-1-naphthylamine