12108
As T ( 1 ) contrast agents ( CAs ) , gadolinium ( III ) complexes linked to beta - cyclodextrin ( Gd - F - beta CD ) or bound to titanium dioxide ( TiO2 @ RhdGd ) were tested .
 gadolinium ( III ), beta - cyclodextrin, Gd - F - beta CD, titanium dioxide, TiO2
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 gadolinium ( III ), beta - cyclodextrin, Gd - F - beta CD, titanium dioxide, TiO2