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In this work , the design and synthesis of biodegradable PSQ particles with extremely high payloads of paramagnetic Gd ( III ) centers is explored , for use as efficient contrast agents for magnetic resonance imaging ( MRI ) .
 Chemical: PSQ; Chemical: Gd ( III )
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: PSQ; Chemical: Gd ( III )