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The platinum drug , oxoplatin , was then subsequently attached to the polymer via ester formation leading to platinum loading of 12 wt % as determined by TGA .
 Chemical: platinum; Chemical: oxoplatin; Chemical: platinum
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: platinum; Chemical: oxoplatin; Chemical: platinum