24201
However , the iron ( Fe ( 3 + ) ) alone , organic ligands alone or the mixture of iron with the organic ligand did not show any potentiation effect , suggesting as the active ingredient is a specific complex rather than two separate additive or synergistic components .
 Chemical: iron; Chemical: Fe ( 3 + ); Chemical: iron
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: Fe ( 3 + ); Chemical: iron