Figure 7From: Pentacycloundecane lactam vs lactone norstatine type protease HIV inhibitors: binding energy calculations and DFT study The frontiers orbitals (HOMO and LUMO) of PCU-lactam (a1 and b1), PCU-lactim (a2 and b2) and PCU-lactone (a3 and b3) models [B3LYP/6-311G(d,p)]. Back to article page