13142
An unexpected Pd - N bond cleavage that resulted in the racemization of the alpha - carbon center in these complexes has also been investigated .
 Chemical: Pd; Chemical: N; Chemical: alpha - carbon
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Pd, N, alpha - carbon 
Answer:
 Chemical: Pd; Chemical: N; Chemical: alpha - carbon