Theobromine, also known as xantheose, is the principal alkaloid of Theobroma cacao (cacao plant). Theobromine is slightly water-soluble (330 mg/L) with a bitter taste. In industry, theobromine is used as an additive and precursor to some cosmetics. It is found in chocolate, as well as in a number of other foods, including the leaves of the tea plant, and the kola nut. It is a white or colourless solid, but commercial samples can appear yellowish.
Most of what I'm going off is from this article here - https://www.sciencedirect.com/science/article/pii/S0187893X15720926#bib0115. This presents methyl iodide as safer than dimethyl sulphate, which is true and helpful, but not safe enough for me to be able to use it at school. I understand its...