21153
Copper - catalyzed diastereoselective arylation of tryptophan derivatives : total synthesis of ( + ) - naseseazines a and B .
 Chemical: Copper; Chemical: tryptophan; Chemical: ( + ) - naseseazines a and B
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: Copper; Chemical: tryptophan; Chemical: ( + ) - naseseazines a and B