16756
Development of SAR in a 5 - aryl - 3 - acylpyridinyl - pyrazoles and 1 - aryl - 4 - acylpyridinyl imidazoles series of mGlu5 receptor negative allosteric modulators ( mGluR5 NAMs ) using a functional cell - based assay is described in this Letter .
 Chemical: 5 - aryl - 3 - acylpyridinyl - pyrazoles; Chemical: 1 - aryl - 4 - acylpyridinyl imidazoles
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
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Answer:
 Chemical: 5 - aryl - 3 - acylpyridinyl - pyrazoles; Chemical: 1 - aryl - 4 - acylpyridinyl imidazoles