Effects of combinations of betulin and betulinic acid derivatives with miltefosine on <i>Leishmania infantum</i> promastigotes viability.

<p>(A) Betulin derivative BT06; (B) Betulinic acid derivative AB13. Values are expressed as means and SEM. Cultures of log-phase promastigotes (2×10⁶ cells.ml⁻¹) were incubated at 26°C for 24 h at different compound concentrations.