SPACI score report for 2b4r in ASTRAL 1.75:

PDB Entry: 2b4r
SPACI score: 0.47
AEROSPACI score: 0.47

Experiment type: XRAY
Resolution: 2.25
R-factor: 0.186
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.567
WCK2 WHAT_CHECK Ramachandran: -2.103
WCK3 WHAT_CHECK Chi angles: -1.261
WCK4 WHAT_CHECK Backbone: -0.61

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).