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The versatility of a previously developed method for the synthesis of chiral carbene - based palladacycles is demonstrated through the synthesis of two new chiral pyridine - functionalized N - heterocyclic carbene palladacycles with different wingtip groups .
 carbene, palladacycles, pyridine, N - heterocyclic carbene, palladacycles
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 carbene, palladacycles, pyridine, N - heterocyclic carbene, palladacycles