SPACI score report for 2pnb in ASTRAL 1.57:

WARNING! The SPACI score for this entry is not valid. This is not an X-ray structure, so the resolution and R-factor listed may be arbitrary and not valid. The resolution is not available. An arbitrary resolution has been used. The R-factor is not available and an abitrary R-factor has been used.

PDB Entry: 2pnb
SPACI score: -0.02 (not valid)
AEROSPACI score: -0.02 (not valid)

Experiment type: NMR
Resolution: 4
R-factor: 0.25
PCK1 PROCHECK Ramachandran: 4
PCK2 PROCHECK Chi-1 angle: 4
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -5.67
WCK2 WHAT_CHECK Ramachandran: -5.787
WCK3 WHAT_CHECK Chi angles: -5.229
WCK4 WHAT_CHECK Backbone: -4.795

Note: Here are links to pages about PROCHECK and WHAT_CHECK.

Here is the full WHAT_CHECK report on this protein (linked from the WHAT_CHECK site).