1501
UV - vis spectroscopy and cyclic voltammetry show that the corresponding dithioester precursor can complex Pb ( 2 + ) in solution and that this property is maintained for monolayers of the dithiol on gold .
 Chemical: dithioester; Chemical: Pb ( 2 + ); Chemical: dithiol
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: dithioester; Chemical: Pb ( 2 + ); Chemical: dithiol