If the top of the vial is shiney rather than dull,the corners of the label are rounded and not squared,then you have yourself the real stuff.If you have it in it's original box,do the sticker test.The sticker should always be able to peel of easy rather than it being glued down and hard to remove.
What it is saying is that it expired May 2001.
And yes, I know from 1st hand experience that the rounded corners with the shiney cap are the real stuff. Dull top and square corners ...fake!