4897
New results on formaldehyde : the 2nd International Formaldehyde Science Conference ( Madrid , 19 - 20 April 2012 ) .
 formaldehyde, Formaldehyde
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 formaldehyde, Formaldehyde