There was an error in the original publication. The paper originally 
reported that the concentrations of compounds used in the reactions were 
in the millimolar (mM) range (e.g., 1 mM for each nitrile studied and 2 mM 
for sodium formate). This was erroneously reported due to a calculation 
error. The concentrations for the original published experiments reported 
are in the molar (M) range (1 M for each nitrile and 2 M for sodium formate). 

The figures and data reported here have not been altered. The original 
supplementary information is presented as millimolar but is in Molar 
concentrations.

The new data labelled as “addendum” is correctly presented and is in 
millimolar concentrations.