9172
A series of novel rock - salt - type Pb ( m ) Sb ( 2n ) Te ( m + 3n ) nanocrystals ( m = 2 , 3 , 4 , 6 , 8 , and 10 ; n = 1 and 2 ) were successfully prepared using a colloidal synthesis route .
 Chemical: Pb ( m ) Sb ( 2n ) Te ( m + 3n )
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: Pb ( m ) Sb ( 2n ) Te ( m + 3n )