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Here we report on the chemical synthesis , CO releasing properties , cytotoxicity profile and pharmacological activities of four novel structurally related iron - allyl carbonyls .
 Chemical: CO; Chemical: iron - allyl carbonyls
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: CO; Chemical: iron - allyl carbonyls