SCF GIAO Magnetic shielding Degeneracy 0.0 1.0 2.0 3.0 4.0 Shift (ppm) 6.0 5.0 4.0 3.0 2.0 1.0 0.0 26-H 52-H 50-H 51-H 53-H 27-H 32-H 24-H 33-H 30-H 42-H 40-H 48-H 43-H 25-H 41-H 31-H 29-H 36-H 28-H 37-H 45-H 49-H 46-H 44-H 35-H 34-H 38-H 39-H 47-H Ref