Observation of <inline-formula><tex-math id="M1">\begin{document}${ {\boldsymbol e^+\boldsymbol e^- \to\boldsymbol p\boldsymbol p \bar{\boldsymbol p} \bar{\boldsymbol n} \boldsymbol\pi^{-} + \boldsymbol c.\boldsymbol c. }}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/5cd9a3a2-971b-493e-8f3d-71dd71f09cae/CPC-2022-0567_M1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/5cd9a3a2-971b-493e-8f3d-71dd71f09cae/CPC-2022-0567_M1.png"/></alternatives></inline-formula> -

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