Fig. 1

Molecular structure and in vitro response and transformation of NSBSO to GSH. A, B The molecular structures of NSBSO and NCBSO. C, D Optical images (inserts) and TEM images of (C) NSBSO and (D) NCBSO after 10 mM GSH treatment at 37 °C for 24 h. E HPLC traces and F the corresponding TEM images of NSBSO in the presence of 0 mM, 1 mM and 10 mM GSH at 37 °C within 6 h. The red a and b in (E) represents NSBSO and Nap-^DF^DFY-thiol, respectively