SPACI score report for 2zok in ASTRAL 2.07:

PDB Entry: 2zok
SPACI score: 0.4
AEROSPACI score: 0.4

Experiment type: XRAY
Resolution: 2.1
R-factor: 0.209
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 0.338
WCK2 WHAT_CHECK Ramachandran: 0.347
WCK3 WHAT_CHECK Chi angles: -0.63
WCK4 WHAT_CHECK Backbone: 1.118

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).