Auto plotting to network plotter withh \\ in name

I have auto plots for pdf's tiffs etc so thought auto plot to plotter A0 no worries but can not get around network name problem \\PRODPRN02\DESIGNA0

The double back slashes are a problem in name any ideas. tried (chr 92 stuff)

(setq plottername "\\PRODPRN02\DesignA0-Plotter")
(COMMAND "-PLOT" "Y" "" plottername
       "ISO A1 - 594 x 841 mm. (landscape)" "m"    "LANDSCAPE"    "N"   "W"  "-6,-6"    "807,560" "1=1"  "C"
       "y"   "Designlasercolour.ctb" "Y" "n"    "n"    "y"   "N" "N" "y"      )
   )

Will this not work?

\\\\PRODPRN02\\DESIGNA0

Thanks Renderman positive I tried that combination but it works now. Sometimes when testing Autocad seems to get it self in a loop and not want to work with changes to code. Had a weekend off that made the difference.

Cheers!