SPACI score report for 2btr in ASTRAL 2.07:

PDB Entry: 2btr
SPACI score: 0.44
AEROSPACI score: 0.44

Experiment type: XRAY
Resolution: 1.85
R-factor: 0.226
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.635
WCK2 WHAT_CHECK Ramachandran: 0.249
WCK3 WHAT_CHECK Chi angles: -2.427
WCK4 WHAT_CHECK Backbone: 1.209

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).