7989
X - ray molecular structures of the complexes showed that two opposing triazine rings of tetraoxacalix [ 2 ] arene [ 2 ] triazine act as a pair of tweezers to interact with the included anions through cooperative anion - pi and lone - pair electron - pi interactions .
 Chemical: triazine; Chemical: tetraoxacalix [ 2 ] arene [ 2 ] triazine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: triazine; Chemical: tetraoxacalix [ 2 ] arene [ 2 ] triazine