SPACI score report for 2x3u in ASTRAL 2.04:

PDB Entry: 2x3u
SPACI score: 0.49
AEROSPACI score: 0.49

Experiment type: XRAY
Resolution: 1.93
R-factor: 0.17544
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.449
WCK2 WHAT_CHECK Ramachandran: -0.795
WCK3 WHAT_CHECK Chi angles: 0.22
WCK4 WHAT_CHECK Backbone: 2.399

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).