See synthesis of drugs in www.drugsyn.org

p-hydroxybenzoic acid is commercially available and can be compared on TLC. Try it out first.

Agnuside is more polar than para-hydroxy benzoic acid

thanks...... but in reverse phase HPLC agnuside come later than PHBA

Look at the MW too, the mobility depends not just on polarity but MW, wich is another important factor.

See synthesis of drugs in www.drugsyn.org

How substituted carbohydrates behave. I thing carbohydrates are more polar hence they are water soluble. A compound with 6 hydroxy groups will be very much polar then a single carboxylic acid group with one hydroxy group.

You're very right, Rajesh...just imagine how many hydrogen bonds could be stablished...