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 .
 anilic acids, H2xa, 2 , 3 - di ( 2 - pyridinyl ) pyrazine, dppz, hydrogen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 anilic acids, H2xa, 2 , 3 - di ( 2 - pyridinyl ) pyrazine, dppz, hydrogen