5815
The N - oxides of M1 , a mixture of two diastereomers designated as M2 and M3 , were also present in plasma and urine , accounting for up to 13 . 2 % of radioactivity in plasma .
 Chemical: N - oxides
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: N - oxides