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Here , we investigated the structure - activity relationship of 24 chiral ureidopropanamides , including previously reported compounds PD168368 / PD176252 and their close analogs , and used molecular modeling to define chiral recognition by FPR2 .
 Chemical: ureidopropanamides; Chemical: PD168368; Chemical: PD176252
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: ureidopropanamides; Chemical: PD168368; Chemical: PD176252