Correction to: Nature Communications https://doi.org/10.1038/s41467-018-06764-3; published online 09 October 2018

The original version of this Article contained an error in Fig. 1, in which an oxygen atom was missing from the ‘Acetoxonium type’ structure. The correct version of Fig. 1 is:

figure 1

Fig. 1

which replaces the previous incorrect version shown below as Fig. 2:

figure 2

Fig. 2

This has been corrected in both the PDF and HTML versions of the Article.