sugars are not soluble in non polar solvents. the oily stuff as mentioned is probably tannins. however it would be interesting if another alkaloid could be detected but a friend of a friend of SWIMs detected no such thing in GC-MS and if the compound was not stable under the conditions in the instrument it probably would not be stable when heated and breakdown. another analytical method would be useful in trying to investigate this buuuut one needs time to do the analysis.