SPACI score report for 2nu5 in ASTRAL 2.06:

PDB Entry: 2nu5
SPACI score: 0.64
AEROSPACI score: 0.64

Experiment type: XRAY
Resolution: 1.56
R-factor: 0.165
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: 1.879
WCK2 WHAT_CHECK Ramachandran: 0.002
WCK3 WHAT_CHECK Chi angles: -1.746
WCK4 WHAT_CHECK Backbone: 0.154

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).