21464
The evidence includes structures with Bis - Tris ( 2 , 2 - bis ( hydroxymethyl ) - 2 , 2 ' , 2 '' - nitrilotriethanol ) and l - ribose in the site and kinetic binding studies with substituted beta - galactosidases .
 Chemical: Bis - Tris ( 2 , 2 - bis ( hydroxymethyl ) - 2 , 2 ' , 2 '' - nitrilotriethanol ); Chemical: l - ribose
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: Bis - Tris ( 2 , 2 - bis ( hydroxymethyl ) - 2 , 2 ' , 2 '' - nitrilotriethanol ); Chemical: l - ribose