SPACI score report for 2b54 in ASTRAL 2.06:

PDB Entry: 2b54
SPACI score: 0.46
AEROSPACI score: 0.46

Experiment type: XRAY
Resolution: 1.85
R-factor: 0.158
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -2.571
WCK2 WHAT_CHECK Ramachandran: -3.328
WCK3 WHAT_CHECK Chi angles: -5.731
WCK4 WHAT_CHECK Backbone: -1.329

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).