12594
The results suggest that the existence of benzimidazole ring and substitution of the imidazolyl - 3 - position with a naphthylacyl or 4 - methoxyphenacyl group were vital for modulating cytotoxic activity .
 Chemical: benzimidazole; Chemical: imidazolyl; Chemical: naphthylacyl; Chemical: 4 - methoxyphenacyl
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: benzimidazole; Chemical: imidazolyl; Chemical: naphthylacyl; Chemical: 4 - methoxyphenacyl