Matrix of similar interfaces for 3D-footprint entry 4x23_D

_ stats: contacts=1 Nring=0 specif=-1.00
_ PDBs:  1:8u14_G,2:8txv_G,3:6qld_f,4:7xsx_a,
_ -lnE:  1:11.0,2:10.6,3:10.6,4:10.3,
_        1 2 3 4
0018 G  RTRGRCRA