9324
The optimized structures show that the ground state structures of Fe2S2 ( 0 / - ) , Fe3S4 ( 0 / - ) and Fe4S4 ( 0 / - ) favor high spin state and are similar to their structures in proteins .
 Chemical: Fe2S2; Chemical: Fe3S4; Chemical: Fe4S4
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: Fe2S2; Chemical: Fe3S4; Chemical: Fe4S4