11337
However , much higher concentrations of EATN were required to inhibit platelet aggregation induced by arachidonic acid .
 Chemical: EATN; Chemical: arachidonic acid
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: EATN, arachidonic acid 
Answer:
 Chemical: EATN; Chemical: arachidonic acid