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The decays of $\jpsi$ and $\psip$ to ${n}{K^0_S}\bar{\Lambda}+c.c.$ areobserved and measured for the first time, and the perturbative QCD ``12%'' ruleis tested, based on $5.8 \times 10^7$ $\jpsi$ and $1.4 \times 10^7$ $\psip$events collected with BESII detector at the Beijing Electron-Positron Collider.No obvious enhancement near $n\bar{\Lambda}$ threshold in $\jpsi \to{n}{K^0_S}\bar{\Lambda}+c.c.$ is observed, and the upper limit on the branchingratio of $\jpsi \to {K^0_S} X, X \to n \bar \Lambda$ is determined.

First observation of J/\psi and \psi(2S) decaying to n K^0_S\bar\Lambda +c.c