14651
Results obtained from the analysis of surf clam and oyster tissues incubated with varying concentrations of toxic Alexandrium algae highlighted expected transformation reactions , although significant differences were observed in the extent of the transformations amongst the range of toxins studied , with less efficient transformation of N - hydroxylated toxins as compared with other carbamate and N - sulfocarbamoyl toxins .
 N, carbamate and N - sulfocarbamoyl
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 N, carbamate and N - sulfocarbamoyl