21601
In addition , 1 demonstrated cytotoxic activity toward human leukemia cells , solid tumor cells of epidermal , breast , and cervical carcinomas , and skin melanoma , with IC50 values between 3 . 6 and 4 . 3 mu M , while 2 was weakly active against leukemia , cervical carcinoma , and skin melanoma cells .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None