Just looked it up in wikipedia and wish I hadn't (I get depressed when I read things I understood in high school and am clueless about now, like chemistry).

On a side note, I found this interesting (it applies to food containers):

Bisphenol A appeared to be released from polycarbonate animal cages into water at room temperature and it may have been responsible for enlargement of the reproductive organs of female mice.

So don't lick your N9's!!!