18460
Synthesis , in vitro antiplatelet activity and molecular modelling studies of 10 - substituted 2 - ( 1 - piperazinyl ) pyrimido [ 1 , 2 - a ] benzimidazol - 4 ( 10H ) - ones .
 Chemical: 10 - substituted 2 - ( 1 - piperazinyl ) pyrimido [ 1 , 2 - a ] benzimidazol - 4 ( 10H ) - ones
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: 10 - substituted 2 - ( 1 - piperazinyl ) pyrimido [ 1 , 2 - a ] benzimidazol - 4 ( 10H ) - ones