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Although the formation of 8 - oxo - GDP from 8 - oxo - GMP is thus prevented , 8 - oxo - GDP itself may be produced by the oxidation of GDP by reactive oxygen species .
 Chemical: 8 - oxo - GDP; Chemical: 8 - oxo - GMP; Chemical: 8 - oxo - GDP; Chemical: GDP; Chemical: oxygen
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: 8 - oxo - GDP; Chemical: 8 - oxo - GMP; Chemical: 8 - oxo - GDP; Chemical: GDP; Chemical: oxygen