24795
These signatures can be explained by the different chemical compositions of the crystal faces , and they reveal a remarkable binding specificity of the thiol group for the sulfur - rich { 100 } and { 110 } faces of the hexagonal and tetragonal forms , respectively .
 Chemical: sulfur
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