18462
Nine out of fifteen 2 - ( 1 - piperazinyl ) derivatives ( 6g - o ) showed good inhibitory properties towards all the platelet aggregation agonists used .
 Chemical: 2 - ( 1 - piperazinyl )
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: 2 - ( 1 - piperazinyl )