6294
Considering the structural features of a group of known potent inhibitors of human platelet aggregation containing hydrazone structural backbone , a series of novel hydrazone derivatives of 2 - hydrazinyl - 1 , 3 , 4 - thiadiazole were synthesized using a one - pot process and tested for their inhibitory activity against platelet aggregation induced by arachidonic acid and ADP .
 Chemical: hydrazone; Chemical: hydrazone; Chemical: 2 - hydrazinyl - 1 , 3 , 4 - thiadiazole; Chemical: arachidonic acid; Chemical: ADP
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: hydrazone; Chemical: hydrazone; Chemical: 2 - hydrazinyl - 1 , 3 , 4 - thiadiazole; Chemical: arachidonic acid; Chemical: ADP