The Flavor Apprentice (also known as Perfumers Apprentice) are industry leaders in flavour concentrates worldwide.
 
Acetyl Pyrazine is typically used to enhance smokey flavours and to bring out a nutty or bready note. 
However it is very strong and not very forgiving so start by adding just a drop at a time 
 
Recommended to start testing at 0.5% to base or less and adjust to taste.
Warning: Some crystallisation will occur. just place in hot bath and shake to use.