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Hydrogen sulfide ( H ( 2 ) S ) was recently discovered to be synthesized in mammalian tissues by several different enzymes .
 Chemical: Hydrogen sulfide; Chemical: H ( 2 ) S
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: Hydrogen sulfide; Chemical: H ( 2 ) S