20784
Calcination of the compound 1 at 500 degrees C under air atmosphere yields Pb3O2Br2 nanoparticles .
 Chemical: Pb3O2Br2
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: Pb3O2Br2