Binding
poses of 6a (a), 6h (b), 10a (c), and 10b (d) in the HIV RNase H binding
site (PDB 3QIP). Important residues are labeled. 6a is represented
as green sticks, 6h as dark purple sticks, 10a as cyan sticks, 10b as pink sticks. The magnesium ions
are represented in purple and their coordination with the nearby atoms
is represented in blue. The H-bonds are represented as a dashed red
line. The protein is represented as orange ribbons and sticks.