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The structure , formation mechanism , and stability of the hybrid nanosheets were investigated in detail by taking the Co 9 S 8 - oleylamine ( Co 9 S 8 - OA ) hybrid nanosheets as an example .
 Chemical: Co 9 S 8; Chemical: oleylamine; Chemical: Co 9 S 8
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 9 S 8; Chemical: oleylamine; Chemical: Co 9 S 8