19106
The chemo - , diastereo - , and enantioselectivities in proline and axially chiral amino sulfonamide - catalyzed direct aldol reactions between two enolizable aldehydes with different electronic nature have been studied with the aid of density functional theory ( DFT ) method .
 proline, amino sulfonamide, aldehydes
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 proline, amino sulfonamide, aldehydes