SPACI score report for 2gu5 in ASTRAL 2.07:

PDB Entry: 2gu5
SPACI score: 0.59
AEROSPACI score: 0.59

Experiment type: XRAY
Resolution: 1.6
R-factor: 0.211
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: 2.639
WCK2 WHAT_CHECK Ramachandran: 0.791
WCK3 WHAT_CHECK Chi angles: -0.11
WCK4 WHAT_CHECK Backbone: 1.321

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).