SPACI score report for 2nn6 in ASTRAL 1.75:

PDB Entry: 2nn6
SPACI score: 0.01
AEROSPACI score: 0.01

Experiment type: XRAY
Resolution: 3.35
R-factor: 0.291
PCK1 PROCHECK Ramachandran: 2
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 4
WCK1 WHAT_CHECK Packing: -3.755
WCK2 WHAT_CHECK Ramachandran: -6.264
WCK3 WHAT_CHECK Chi angles: -5.686
WCK4 WHAT_CHECK Backbone: -3.579

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).