I agree with you but citric acid is a bit different as its not a volatile aroma compound in a lemon, its only sour and you taste it. I couldn't find a specific

I agree with you but citric acid is a bit different as its not a volatile aroma compound in a lemon, its only sour and you taste it. I couldn't find a specific flavor compound responsible for lemon flavor in a quick google search but limonene appears to be responsible for the aroma of oranges...