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The alpha - subunit of tryptophan synthase ( alpha TS ) catalyzes the conversion of indole - 3 - glycerol phosphate to d - glyceraldehyde - 3 - phosphate and indole .
 Chemical: tryptophan; Chemical: indole - 3 - glycerol phosphate; Chemical: d - glyceraldehyde - 3 - phosphate; Chemical: indole
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: tryptophan; Chemical: indole - 3 - glycerol phosphate; Chemical: d - glyceraldehyde - 3 - phosphate; Chemical: indole