Brown sugar substitute for someone allergic to molasses?

I cannot eat molasses due to what I suppose is a rare food intolerance...Even a single cookie or bowl of cereal can leave me nauseous and dizzy. This means I can't use brown sugar and raw sugar in recipes. Often, white sugar can be substituted without too much of an impact on the taste, but certain things (e.g., candied yams) just don't work.

Is there any blend of sugar/spices that might work as an acceptable substitute for taste while preserving the chemistry?