17599
In case of antioxidant activity , compound 4a showed promising radical scavenging activity , ferric ions ( Fe ( 3 + ) ) reducing antioxidant power ( FRAP ) and metal chelating activity .
 Chemical: ferric; Chemical: Fe ( 3 + )
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: ferric; Chemical: Fe ( 3 + )