21248
The internally hydrogen - bonded conformer is predominant also for 2X - phenol species , as calculated on the basis of relative CBS internal free energies and IEF - PCM and FEP / MC solvation free energies .
 Chemical: hydrogen; Chemical: phenol
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: hydrogen, phenol 
Answer:
 Chemical: hydrogen; Chemical: phenol