9064
Spectroscopic studies have been complicated by the highly delocalized nature of the porphyrin , and calculations require interpretation of multideterminant wave functions for a highly covalent metal site .
 Chemical: porphyrin
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: porphyrin