Matrix of similar interfaces for 3D-footprint entry 7c9a_B

_ stats: contacts=4 Nring=2 specif=0.50
_ PDBs:  1:8trg_A,
_ -lnE:  1:23.4,
_        1
0216 L* MG
0221 M  RT
0250 Q  KT
0251 P* IG