2-(L-cystein-S-yl)-2-(1H-indol-3-yl)-acetonitrile + 2 reduced [NADPH--hemoprotein reductase] + 2 O2 = camalexin + hydrogen cyanide + 2 oxidized [NADPH--hemoprotein reductase] + CO2 + 4 H2O + 2 H(+) — reaction