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The derivatives were active in all the tested cell lines , and compound 1b , the most active one , was able to overcome cisplatin resistance in the osteosarcoma U2OS / Pt cell line .
 Chemical: cisplatin
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: cisplatin