23679
Antithrombotic activity of a newly synthesized coumarin derivative 3 - ( 5 - hydroxy - 2 , 2 - dimethyl - chroman - 6 - yl ) - N - { 2 - [ 3 - ( 5 - hydroxy - 2 , 2 - dimethyl - chroman - 6 - yl ) - propionylamino ] - ethyl } - propionamide .
 coumarin, 3 - ( 5 - hydroxy - 2 , 2 - dimethyl - chroman - 6 - yl ) - N - { 2 - [ 3 - ( 5 - hydroxy - 2 , 2 - dimethyl - chroman - 6 - yl ) - propionylamino ] - ethyl } - propionamide
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 coumarin, 3 - ( 5 - hydroxy - 2 , 2 - dimethyl - chroman - 6 - yl ) - N - { 2 - [ 3 - ( 5 - hydroxy - 2 , 2 - dimethyl - chroman - 6 - yl ) - propionylamino ] - ethyl } - propionamide