Removing Mothball Smell from a Leather Chair?

I bought a used leather chair, under a year old, 2 days ago. It looks great, but smells horribly of mothballs. I just thought it was the lady packing up that was creating the mothball smell. Since getting it home, I have used Zorbx, Fabreze (made it worse), leather cleaner, 3 washings with vinegar and water, and now am using newspaper, with baking soda on top. I cleaned the whole underneath the same way I cleaned the rest of the chair. The smell is still there. Is this a lost cause? It is a nice chair and I hate to donate or throw it out. I have quite an aversion to smells so even cleaning it with vinegar is challenging. Any suggestions?