19385
Cocrystallization of anilic acids ( H2xa ) and 2 , 3 - di ( 2 - pyridinyl ) pyrazine ( dppz ) affords a variety of molecular geometries , including hydrogen - bonding and supramolecular structures .
 Chemical: anilic acids; Chemical: H2xa; Chemical: 2 , 3 - di ( 2 - pyridinyl ) pyrazine; Chemical: dppz; Chemical: hydrogen
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: anilic acids, H2xa, 2 , 3 - di ( 2 - pyridinyl ) pyrazine, dppz, hydrogen 
Answer:
 Chemical: anilic acids; Chemical: H2xa; Chemical: 2 , 3 - di ( 2 - pyridinyl ) pyrazine; Chemical: dppz; Chemical: hydrogen