19557
This spectral assignment is supported by analogous experiments on [ CpFe ( CO ) 2 ] 2 in the same solvent , combined with DFT studies on the structures of the 19 - electron adducts .
 Chemical: [ CpFe ( CO ) 2 ] 2
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: [ CpFe ( CO ) 2 ] 2