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Compound 1b exhibited an appreciable antitumor activity in vivo against human H460 tumor xenograft , comparable to that of irinotecan at lower well - tolerated dose levels and superior to cisplatin .
 Chemical: irinotecan; 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: irinotecan; Chemical: cisplatin