SPACI score report for 2ntt in ASTRAL 2.07:

PDB Entry: 2ntt
SPACI score: 0.61
AEROSPACI score: 0.61

Experiment type: XRAY
Resolution: 1.56
R-factor: 0.165
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -2.136
WCK2 WHAT_CHECK Ramachandran: -0.023
WCK3 WHAT_CHECK Chi angles: -1.048
WCK4 WHAT_CHECK Backbone: -1.384

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).