14653
Total conversion of N - sulfocarbamoyl toxins was confirmed at low relative proportions of surf clam tissue in all three species , whereas transformation of carbamate toxins was found to occur only in the presence of higher proportions of surf clam tissue in oysters and mussels in comparison with scallops .
 N, carbamate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 N, carbamate