20586
Complementary density functional theory calculations suggest that the reaction is most likely mediated by a monothiolate RS - Au complex bonded to the gold surface , which forms a trithiolate RS - Au - ( SR ) - Au - SR complex as a key intermediate .
 Chemical: RS - Au; Chemical: trithiolate; Chemical: RS - Au - ( SR ) - Au - SR
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: RS - Au; Chemical: trithiolate; Chemical: RS - Au - ( SR ) - Au - SR