10512
Mass spectrometry and atomic absorption spectroscopy experiments revealed metal binding to proteins , and efficient cellular uptake was observed using a di - n - butyltin ( IV ) complex as an example .
 Chemical: di - n - butyltin ( IV )
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: di - n - butyltin ( IV ) 
Answer:
 Chemical: di - n - butyltin ( IV )