(E)-(indol-3-yl)acetaldehyde oxime + glutathione + reduced [NADPH--hemoprotein reductase] + O2 = (E)-1-(glutathione-S-yl)-2-(1H-indol-3-yl)acetohydroximate + oxidized [NADPH--hemoprotein reductase] + 2 H2O + H(+) — reaction