SPACI score report for 1sy6 in ASTRAL 1.75:

PDB Entry: 1sy6
SPACI score: 0.49
AEROSPACI score: -1.51 (chimer; see below)

Experiment type: XRAY
Resolution: 2.1
R-factor: 0.211
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.059
WCK2 WHAT_CHECK Ramachandran: -0.956
WCK3 WHAT_CHECK Chi angles: -1.025
WCK4 WHAT_CHECK Backbone: -0.088

The AEROSPACI score for this entry is lower than the SPACI score because human-curated comments on the entry in SCOP contain the phrase chimer. The full comment is: "MQ P09693 P07766 # artificial chimera; MQ P01750 P01863 # natural chimera; MQ P04940 P01837 # natural chimera"

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).