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Structural Modifications to Tetrahydropyridine - 3 - carboxylate Esters en Route to the Discovery of M ( 5 ) - Preferring Muscarinic Receptor Orthosteric Antagonists .
 Chemical: Tetrahydropyridine - 3 - carboxylate Esters
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: Tetrahydropyridine - 3 - carboxylate Esters