Converts L-phenylalanine into phenylacetaldoxime, the precursor of benzylglucosinolate (glucotropeolin). L-phenylalanine + 2 O2 + 2 reduced [NADPH--hemoprotein reductase] = (E)-phenylacetaldehyde oxime + CO2 + 2 H(+) + 3 H2O + 2 oxidized [NADPH--hemoprotein reductase] Secondary metabolite biosynthesis; phenylglucosinolate biosynthesis. Belongs to the cytochrome P450 family. Truncated N-terminus.