SPACI score report for 2zt1 in ASTRAL 2.05:

PDB Entry: 2zt1
SPACI score: 0.82
AEROSPACI score: 0.82

Experiment type: XRAY
Resolution: 1.21
R-factor: 0.155
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 0.14
WCK2 WHAT_CHECK Ramachandran: 0.567
WCK3 WHAT_CHECK Chi angles: 0.652
WCK4 WHAT_CHECK Backbone: 1.353

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).