259589
This group can be viewed as a molecule of ethene ( ethylene , H2C = CH2 ) with an hydrogen removed from each carbon ; or a vinyl group − CH = CH2 with one hydrogen removed from the terminal carbon .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None