8186
Upon interaction of NO ( 2 ) molecules with the Zr - MOF in dry conditions , the bond between the organic linker and metallic oxide center is broken , leading to the formation of nitrate and nitrite species .
 Chemical: NO ( 2 ); Chemical: Zr; Chemical: oxide; Chemical: nitrate; Chemical: nitrite
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: NO ( 2 ); Chemical: Zr; Chemical: oxide; Chemical: nitrate; Chemical: nitrite