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(a, b) BER D in PDB entry 3vw2 after refinement with QMR restraints (teal) and after refinement with GeoStd restraints (orange). The electron density is computed with the model from QMR refinement. Blue, 2mF obs − DF model map at 1 r.m.s. and 1.5 Å carve; green/red, mF obs − DF model map at ±3 r.m.s. and 2 Å carve. (c) Close-up of the central unsaturated six-membered ring.
