12797
Our images reveal a sulfur abstraction and cyclization reaction that converts tetrathienoanthracene precursors into pentacene on the Ni ( 111 ) surface .
 Chemical: sulfur; Chemical: tetrathienoanthracene; Chemical: pentacene; Chemical: Ni ( 111 )
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: sulfur; Chemical: tetrathienoanthracene; Chemical: pentacene; Chemical: Ni ( 111 )