N-hydroxylase that converts L-tyrosine to p-hydroxyphenylacetaldehyde oxime. L-tyrosine + 2 O2 + 2 reduced [NADPH--hemoprotein reductase] = (E)-4-hydroxyphenylacetaldehyde oxime + CO2 + 2 H(+) + 3 H2O + 2 oxidized [NADPH--hemoprotein reductase] Secondary metabolite biosynthesis; dhurrin biosynthesis; dhurrin from L-tyrosine: step 1/3. Belongs to the cytochrome P450 family.