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The process $e^+e^-\rightarrow pK^{0}_{S}\bar{n}K^{-} + c.c.$ and itsintermediate processes are studied for the first time, using data samplescollected with the BESIII detector at BEPCII at center-of-mass energies of3.773, 4.008, 4.226, 4.258, 4.358, 4.416, and 4.600 GeV, with a totalintegrated luminosity of 7.4 fb$^{-1}$. The Born cross section of $e^+e^- \to pK^{0}_S\bar{n}K^- + c.c.$ is measured at each center-of-mass energy, but nosignificant resonant structure in the measured cross-section line shape between3.773 and 4.600 GeV is observed. No evident structure is detected in the$pK^-$, $nK^{0}_S$, $pK^0_{S}$, $nK^+$, $p\bar{n}$, or $K^{0}_S K^-$ invariantmass distributions except for $\Lambda(1520)$. The Born cross sections of$e^+e^-\rightarrow\Lambda(1520)\bar{n}K^{0}_{S} + c.c.$ and $e^+e^-\rightarrow\Lambda(1520)\bar{p}K^{+} + c.c.$ are measured, and the 90\% confidence levelupper limits on the Born cross sections of$e^+e^-\rightarrow\Lambda(1520)\bar{\Lambda}(1520)$ are determined at the sevencenter-of-mass energies.

First measurement of $e^+ e^- \to pK^{0}_{S}\bar{n}K^{-} + c.c.$ above open charm threshold