19391
The ferroelectricity induced by a modest hydrostatic pressure corroborates the conclusion that the ionic state with a dipolar [ H - dppz ( + ) ] [ Hfa ( - ) ] chain is energetically close to the nonpolar neutral ground state of the [ dppz ] [ H2fa ] crystal .
 Chemical: [ H - dppz ( + ) ] [ Hfa ( - ) ]; Chemical: [ dppz ] [ H2fa ]
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: [ H - dppz ( + ) ] [ Hfa ( - ) ], [ dppz ] [ H2fa ] 
Answer:
 Chemical: [ H - dppz ( + ) ] [ Hfa ( - ) ]; Chemical: [ dppz ] [ H2fa ]