What is the Chemical Compound that has a NFPA 704 (Fire Diamond) of 2-2-1-ox?
From what I found NIOSH lists 6 compounds with 2-2-1 pattern, but none of them are labeled with oxidizing properties:  


ethylhexaldehyde: NFPA 704 2-2-1;  
benzyl chloride: NFPA 704 2-2-1;  
2-methyl-1-butanol: NFPA 704 2-2-1;  
n-octyl mercaptan: NFPA 704 2-2-1;  
vinyl toluene: NFPA 704 2-2-1;  
methyl chloroacetate: NFPA 704 2-2-1.


On the other hand, there are oxidizers with slightly different NFPA diamond which much as well be the candidates:


ammonium dichromate NFPA 704 2-1-1-OX;   
amyl nitrate NFPA 704 2-2-0-OX.


The values might deviate a little in different sources and they also depend on conditioning.