2093
Modulation of the nitric oxide producing system ( demonstrated via the NADPH - diaphorase histochemical reaction ) by oestradiol has been established in several structures of the rat brain .
 Chemical: nitric oxide; Chemical: NADPH; Chemical: oestradiol
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: nitric oxide; Chemical: NADPH; Chemical: oestradiol