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In order to develop a novel kidney - targeted drug delivery system , we synthesized prednisolone carbamate - glucosamine conjugate ( PCG ) using 2 - glucosamine as a ligand , and investigated its potential targeting efficacy .
 prednisolone carbamate, glucosamine, 2 - glucosamine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 prednisolone carbamate, glucosamine, 2 - glucosamine