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Boger et al . synthesized a series of C20 ' urea derivatives of vinblastine that matched or exceeded the potency of vinblastine in cell growth inhibition assays .
 Chemical: urea; Chemical: vinblastine; Chemical: vinblastine
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: urea; Chemical: vinblastine; Chemical: vinblastine