Notice that I'm still calling the fruit mangosteen, even though I don't know for sure that's the correct name. In the previous image I showed the whole fruit and leaves. I suppose if I'm to get any help in classifying it, I'd better show what it looks like inside. As you can see there are five segments. If by chance there are normally six segments in a fruit, one was without seed. Indeed there were six segments but one was quite small and without seed.