17816
Synthesis and structure - activity relationship of a series of substituted piperidinyl glycine 2 - cyano - 4 , 5 - methano pyrroline DPP - IV inhibitors are described .
 Chemical: piperidinyl glycine 2 - cyano - 4 , 5 - methano pyrroline
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: piperidinyl glycine 2 - cyano - 4 , 5 - methano pyrroline