17499
To further evaluate the reliability of hydrogen isotopes of organic molecules , we examined the isotope exchangeability in fatty acids within phospholipid bilayers exposed to D ( 2 ) O for 12h .
 Chemical: hydrogen; Chemical: fatty acids; Chemical: D ( 2 ) O
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: hydrogen; Chemical: fatty acids; Chemical: D ( 2 ) O