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In general , thiosemicarbazides showed higher scavenging activity towards DPPH and galvinoxyl radicals than did 4 - thiazolidinones and some of them had the same or even better activity than had ascorbic acid itself , depending on the free radical used .
 thiosemicarbazides, DPPH, galvinoxyl, 4 - thiazolidinones, ascorbic acid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 thiosemicarbazides, DPPH, galvinoxyl, 4 - thiazolidinones, ascorbic acid