SPACI score report for 2ad8 in ASTRAL 2.07:

PDB Entry: 2ad8
SPACI score: 0.6
AEROSPACI score: 0.6

Experiment type: XRAY
Resolution: 1.6
R-factor: 0.174
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -2.063
WCK2 WHAT_CHECK Ramachandran: -1.603
WCK3 WHAT_CHECK Chi angles: 0.572
WCK4 WHAT_CHECK Backbone: 1.519

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).