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In addition , Fe2 S2 , Fe3 S4 , Fe3 S4 ( - ) , Fe4 S4 , and Fe4 S4 ( - ) are antiferromagnetic at the B3LYP / 6 - 311 + G * level .
 Chemical: Fe2 S2; Chemical: Fe3 S4; Chemical: Fe3 S4 ( - ); Chemical: Fe4 S4; Chemical: Fe4 S4 ( - )
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: Fe2 S2; Chemical: Fe3 S4; Chemical: Fe3 S4 ( - ); Chemical: Fe4 S4; Chemical: Fe4 S4 ( - )