Repeat it, 25 times at the first shot until it's smooth and sounds more like your 'idealized' slur to your ear. Try to 'connect' the notes (legato) as best you can with no 'air' in between them and dont forget to release the 1st note (Eb) or just leave a slight hang onto it if any. Just take one finger first off and slide off a black note on to a white. Drink moderately for an hour or so, then go to the piano, the slurs will start to happen automatically! No, just kidding!
