SPACI score report for 1is1 in ASTRAL 1.73:

PDB Entry: 1is1
SPACI score: 0.4
AEROSPACI score: 0.4

Experiment type: XRAY
Resolution: 2.2
R-factor: 0.203
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: 0.357
WCK2 WHAT_CHECK Ramachandran: 1.037
WCK3 WHAT_CHECK Chi angles: -0.866
WCK4 WHAT_CHECK Backbone: -0.048

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).