definitely fumaric acid precipitation...what you can do is
extract with d-limonene..use fumaric acid saturated water...and then clean the result of THAT up..it will be way easier than defatting...
also you could use sodium carbonate that you can convert from sodium bicarbonate(baking soda) you should be able to find that anywhere
here is an idea...
use a wheat grass juicer to get all the nice lovely green juice...add heaps of sodium carbonate...and then try extracting with d-limonene..or heptane(if you use heptane im thinking you can use FASA) but if you use d-limo then use FASW
evaporate the FASW or collect the precips from FASA...then clean that stuff...should work?