SPACI score report for 2c4o in ASTRAL 2.01:

PDB Entry: 2c4o
SPACI score: 0.4
AEROSPACI score: 0.4

Experiment type: XRAY
Resolution: 1.94
R-factor: 0.227
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.018
WCK2 WHAT_CHECK Ramachandran: -3.054
WCK3 WHAT_CHECK Chi angles: -3.789
WCK4 WHAT_CHECK Backbone: 0.167

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).