19443
Additionally , the structure - activity relationship is elucidated on the basis of the functional groups that were attached to the nuclei of benzimidazole , coumarin , and ribofuranose of the hybrids .
 Chemical: benzimidazole; Chemical: coumarin; Chemical: ribofuranose
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: coumarin; Chemical: ribofuranose