SPACI score report for 2b4w in ASTRAL 1.73:

PDB Entry: 2b4w
SPACI score: 0.48
AEROSPACI score: 0.48

Experiment type: XRAY
Resolution: 1.98
R-factor: 0.132
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.239
WCK2 WHAT_CHECK Ramachandran: -1.183
WCK3 WHAT_CHECK Chi angles: -1.709
WCK4 WHAT_CHECK Backbone: -5.886

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).