13337
A series of novel 5 - ( ( 1 - aroyl - 1H - indol - 3 - yl ) methylene ) - 2 - thioxodihydropyrimidine - 4 , 6 ( 1H , 5H ) - diones ( 3a - z ) have been evaluated for in vitro cytotoxicity against a panel of 60 human tumor cell lines .
 Chemical: 5 - ( ( 1 - aroyl - 1H - indol - 3 - yl ) methylene ) - 2 - thioxodihydropyrimidine - 4 , 6 ( 1H , 5H ) - diones
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: 5 - ( ( 1 - aroyl - 1H - indol - 3 - yl ) methylene ) - 2 - thioxodihydropyrimidine - 4 , 6 ( 1H , 5H ) - diones