12985
N - Methyl - 5 , 6 , 7 - trimethoxylindoles 21 and 31 displayed the highest antiproliferative activities , with IC ( 50 ) values ranging from 22 to 125 nM in four human cancer cell lines and activated human umbilical vein endothelial cells ( HUVECs ) .
 Chemical: N - Methyl - 5 , 6 , 7 - trimethoxylindoles
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: N - Methyl - 5 , 6 , 7 - trimethoxylindoles