1287
The dominant reactions are near - thermoneutral proton and deuteron transfer , generating HCO ( + ) and DCO ( + ) product ions by a predominantly direct mechanism .
 Chemical: deuteron; Chemical: HCO ( + ); Chemical: DCO ( + )
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: deuteron; Chemical: HCO ( + ); Chemical: DCO ( + )