9365
The thymine analog 5 - chlorouridine , first reported in the 1950s as anti - tumor agent , is known as an effective mutagen , clastogen and toxicant as well as an effective inducer of sister - chromatid exchange .
 Chemical: thymine; Chemical: 5 - chlorouridine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: thymine; Chemical: 5 - chlorouridine