Chord Csus2 (5th fret) notes: C, D, G and C. You must leave out the 2nd and 1st strings.
This chord is played by placing a barre on fret five with your index finger.
Csus2 - C suspended 2nd guitar chord is often noted with non-standard names like C5add2, C2(no3) or C2. Sometimes it's referred to as Cadd9(no3).
1(C), 2(D), 5(G).