9062
Iron L - edge X - ray absorption spectroscopy of oxy - picket fence porphyrin : experimental insight into Fe - O2 bonding .
 Chemical: Iron; Chemical: porphyrin; Chemical: Fe; Chemical: O2
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: Iron; Chemical: porphyrin; Chemical: Fe; Chemical: O2