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(A) gp120IIIb with RSSS3NO. The ligand contains a 3.1 Å internal hydrogen bond, and interacts with R9 (3.1 Å), T8 (3.9 Å), and S408. (B) gp120YU2 with RSSR3NI. The ligand has a 3.0 Å internal hydrogen bond and interacts with N7 (3.6 Å), T8 (3.6 Å), R3 (3.0 Å) and R396 (3.2 Å).
