28433
Chiral dienes as " ligands " for borane - catalyzed metal - free asymmetric hydrogenation of imines .
 Chemical: dienes; Chemical: borane; Chemical: imines
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: dienes, borane, imines 
Answer:
 Chemical: dienes; Chemical: borane; Chemical: imines