Unfortunately for you, there is some reorganization going on in that area, so it may take a longer time to receive a review. As a result of the reorganization, your site has been moved, and it is now awaiting review in
http://dmoz.org/Business/Chemicals/ with several hundred others.
Due to the large backlog and the ongoing reorganization efforts I strongly suggest saving yourself some time and effort by waiting at least three months before requesting a status update.