1940
Based on the present study ( 99m ) Tc - Dendrimer G ( 2 ) - Methionin or 99mTc - DTPA - ( Methionine ) ( 1 ) have potentials to be used in tumor molecular imaging as well as cancer therapy in future .
 ( 99m ) Tc, Methionin, 99mTc, DTPA, Methionine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 ( 99m ) Tc, Methionin, 99mTc, DTPA, Methionine