12609
The Gd - loaded polymer ( PolyGd ) , and Gd - Dox co - loaded nanoparticles ( PolyGd - Dox ) significantly enhanced MR signals , with ionic T1 relaxivities 3 - 5 times higher than those from Omniscan (R) , a small molecule contrast agent .
 Chemical: Gd; Chemical: PolyGd; Chemical: Gd; Chemical: Dox; Chemical: PolyGd - Dox; Chemical: Omniscan
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: Gd; Chemical: PolyGd; Chemical: Gd; Chemical: Dox; Chemical: PolyGd - Dox; Chemical: Omniscan