9336
Using an estimate of the donor - acceptor energy stabilization , the affinity of a given Mn ( II ) d - orbital to mix with the sp ( 2 ) orbital from pyridine can be predicted .
 Mn ( II ), pyridine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Mn ( II ), pyridine