SPACI score report for 4i3s in ASTRAL 2.07:

PDB Entry: 4i3s
SPACI score: 0.19
AEROSPACI score: 0.19

Experiment type: XRAY
Resolution: 2.85
R-factor: 0.253
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.654
WCK2 WHAT_CHECK Ramachandran: -3.018
WCK3 WHAT_CHECK Chi angles: -4.767
WCK4 WHAT_CHECK Backbone: 1.147

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).