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The highest tested selectivity towards tumour cells was observed for the imidazolyl substituted phenylene - benzothiazole 3d that showed no cytotoxic effects on normal fibroblasts making it an excellent candidate for further chemical optimization and preclinical evaluation .
 Chemical: imidazolyl substituted phenylene - benzothiazole
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
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Answer:
 Chemical: imidazolyl substituted phenylene - benzothiazole