Correction to: Scientific Reports https://doi.org/10.1038/s41598-017-16405-2, published online 22 November 2017

In this Article, an earlier version of Figure 1 is shown. The correct version of Figure 1 appears below.

Figure 1
figure 1

Synthetic route of compounds used. (a) Na2Sx, TBAB, H2O-CHCl3, rt, 12 h; (b) H2O, HCl, 40 °C, 3 h; (c) H2O2, AcOH/H2O, rt, 4 h; (d) H2O2, AcOH/H2O, 50 °C, 4 h.