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 ( + )
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: deuteron, HCO ( + ), DCO ( + ) 
Answer:
 Chemical: deuteron; Chemical: HCO ( + ); Chemical: DCO ( + )