Fig. 4.

(A) Combination mode diagram and molecular simulation of interaction between betulinic acid (BTA) and paclitaxel (PTX). Reproduced with permission from Ref. [64]. Copyright 2020, Elsevier Publishing Group; (B) Schematic representation of self-assembly behavior of ergosterol (Erg) and molecular stacking models of co-assembled Erg-Ce6 nanoparticles. Reproduced with permission from Ref. [66]. Copyright 2019, American Chemical Society; (C) Schematic diagram of celastrol-doxorubicin nanoparticles reversing drug resistance in tumor cells. Reproduced with permission from Ref. [69]. Copyright 2018, The Royal Society of Chemistry.