SPACI score report for 2zlu in ASTRAL 1.75:

PDB Entry: 2zlu
SPACI score: 0.53
AEROSPACI score: 0.53

Experiment type: XRAY
Resolution: 2
R-factor: 0.195
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: -0.186
WCK2 WHAT_CHECK Ramachandran: -0.201
WCK3 WHAT_CHECK Chi angles: -1.356
WCK4 WHAT_CHECK Backbone: 1.061

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).