10214
The Schiff bases of 2 - iso - propyl - 5 - methyl - phenol ( thymol / 1a ) , 2 - tert - butyl - 5 - methyl - phenol ( 1b ) and 5 - iso - propyl - 2 - methyl - phenol ( carvacrol / 1c ) exhibited much better antioxidant activity than thymol and carvacrol in DPPH assay .
 Schiff bases, 2 - iso - propyl - 5 - methyl - phenol, thymol, 2 - tert - butyl - 5 - methyl - phenol, 5 - iso - propyl - 2 - methyl - phenol, carvacrol, thymol, carvacrol, DPPH
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Schiff bases, 2 - iso - propyl - 5 - methyl - phenol, thymol, 2 - tert - butyl - 5 - methyl - phenol, 5 - iso - propyl - 2 - methyl - phenol, carvacrol, thymol, carvacrol, DPPH