SPACI score report for 2z6s in ASTRAL 2.06:

PDB Entry: 2z6s
SPACI score: 0.78
AEROSPACI score: 0.78

Experiment type: XRAY
Resolution: 1.25
R-factor: 0.187
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: 0.022
WCK2 WHAT_CHECK Ramachandran: 1.027
WCK3 WHAT_CHECK Chi angles: 0.533
WCK4 WHAT_CHECK Backbone: 1.419

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).