28768
Two new bis ( trialkoxysilyl ) derivatives of Gd ( III ) diethylenetriamine pentaacetate ( Gd - DTPA ) containing disulfide linkages are synthesized and used to form biodegradable Gd - PSQ particles by base - catalyzed condensation reactions in reverse microemulsions .
 Chemical: bis ( trialkoxysilyl ); Chemical: Gd ( III ) diethylenetriamine pentaacetate; Chemical: Gd - DTPA; Chemical: disulfide; Chemical: Gd - PSQ
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: bis ( trialkoxysilyl ); Chemical: Gd ( III ) diethylenetriamine pentaacetate; Chemical: Gd - DTPA; Chemical: disulfide; Chemical: Gd - PSQ