16442
Tetraarylmethane compounds consisting of two pyrogallol and two aniline units , namely , Ar2CAr ' 2 { Ar = 3 , 4 , 5 - C6H2 ( OH ) 3 and Ar ' = 3 , 5 - R2 - 4 - C6H2NH2 [ R = Me ( 1 ) , iPr ( 2 ) ] } exhibit excellent self - assembly behavior .
 Chemical: Tetraarylmethane; Chemical: pyrogallol; Chemical: aniline; Chemical: Ar2CAr ' 2; Chemical: 3 , 4 , 5 - C6H2 ( OH ) 3; Chemical: 3 , 5 - R2 - 4 - C6H2NH2; Chemical: iPr
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: Tetraarylmethane; Chemical: pyrogallol; Chemical: aniline; Chemical: Ar2CAr ' 2; Chemical: 3 , 4 , 5 - C6H2 ( OH ) 3; Chemical: 3 , 5 - R2 - 4 - C6H2NH2; Chemical: iPr