27212
3 - Hydroperoxy - N - nitrosomorpholine in buffered aqueous media in the presence of calf thymus DNA was treated with a phosphine reductant to generate the transient alpha - hydroxynitrosamine and subsequent diazonium ion that alkylated the DNA , as previously reported .
 3 - Hydroperoxy - N - nitrosomorpholine, alpha - hydroxynitrosamine, diazonium
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 3 - Hydroperoxy - N - nitrosomorpholine, alpha - hydroxynitrosamine, diazonium