18035
Hydrogen sulfide ( H ( 2 ) S ) has been increasingly recognized as an important signaling molecule that regulates both blood pressure and neuronal activity .
 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