tokens: We kindly thank Jun Li and Hua Guo for providing the potential energy surface. Astrochemistry in Leiden in general was supported by the European Community’s Seventh Framework Programme (FP7/2007–2013) under grant agreement No. 238258, the Netherlands Research School for Astronomy (NOVA) and from the Netherlands Organization for Scientific Research (NWO) within the framework of the Dutch Astrochemistry Network. SI acknowledges the Royal Society for financial support. T.L. was supported by the Dutch Astrochemistry Network financed by NWO. T.L. and J.K. were financially supported by the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 646717, TUNNELCHEM).
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