SPACI score report for 3c8y in ASTRAL 2.02:

PDB Entry: 3c8y
SPACI score: 0.73
AEROSPACI score: 0.73

Experiment type: XRAY
Resolution: 1.39
R-factor: 0.14
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.654
WCK2 WHAT_CHECK Ramachandran: -0.054
WCK3 WHAT_CHECK Chi angles: -0.17
WCK4 WHAT_CHECK Backbone: 3.132

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).