10509
Based on the outcome of a virtual screening study , various di - and tri - n - butyltin ( IV ) carboxylates were synthesized , and their biological properties were evaluated .
 di - and tri - n - butyltin ( IV ) carboxylates
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 di - and tri - n - butyltin ( IV ) carboxylates