Tough progress for Terrors
Dundee United were rewarded for their excellent Scottish Cup victory at Rangers by being paired with their Old Firm rivals Celtic in the last eight of the competition.
The Tangerines will take on the current holders at Tannadice over the weekend of the 10th and 11th March.
And there could still be a couple of other all SPL ties in the sixth round dependent upon replays, with Aberdeen visiting Motherwell if they can finally see-off the challenge of Queen of the South, while St Mirren go to one of Hearts or St Johnstone should they defeat Ross County.
Hibernian visit either Ayr United or Falkirk in the remaining quarter-final.