SPACI score report for 1zn2 in ASTRAL 1.73:

PDB Entry: 1zn2
SPACI score: 0.16
AEROSPACI score: 0.16

Experiment type: XRAY
Resolution: 2.91
R-factor: 0.269
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.302
WCK2 WHAT_CHECK Ramachandran: -4.778
WCK3 WHAT_CHECK Chi angles: -2.842
WCK4 WHAT_CHECK Backbone: -2.768

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).