21331
In this paper , a novel method was proposed to prepare artificial antigens of gonyaulax parlaytic shellfish toxin 2 and 3 ( GTX2 , 3 ) .
 Chemical: GTX2 , 3
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: GTX2 , 3