Copernicus Crater- An Anomalous Structure

Below we can see a the photograph of copernicus crater med_5151 from lunar orbiter V. We can see

the enlarged version vhr_5151_h1 which I have hightlighed below. If we enlarge the image (red circle) we can see a white rectangular geometrical shape strucutre. See the enlarged image below.

Is this shows that it is an artificial construction? An evidence of alien activity ? An evidence of old ruins ?

lpi.usra.edu/resources/lunarorbiter/frame/?5151

vhr_5151_h1