Unfortunately, there is no perfect replacement for Quinacridone Burnt Orange at this time, but a blend of Transparent Red Iron Oxide (PR101), Quinacridone Magenta (PR122) and Phthalo Green BS (PG7), as shown here, should get you into a similar range.
You can learn more about pigment discontinuations in a JustPaint.org article called "The Life of Pigments in Fine Art Paints" and try out your own replacement blends with our Virtual Color Mixer. Both of these resources are linked below in this caption.
Virtual Color Mixer - goldenpaints.com/mixer
Learn more pigment discontinuations -
justpaint.org/the-life-of-pigments-in-fine-art-paints/
