Glutamic acid
Glutamate is also a neurotransmitter (see below), which makes it one of the most abundant molecules in the brain. Malignant brain tumors known as glioma or glioblastoma exploit this phenomenon by using glutamate as an energy source, especially when these tumors become more dependent on glutamate due to mutations in the gene "IDH1".
Solomon H. Snyder
Solomon Halbert Snyder (born December 26, 1938) is an American neuroscientist who is known for wide-ranging contributions to neuropharmacology and neurochemistry. He studied at Georgetown University, and has conducted the majority of his research at the Johns Hopkins School of Medicine. Many advances in molecular neuroscience have stemmed from Dr. Snyder's identification of receptors for neurotransmitters and drugs, and elucidation of the actions of psychotropic agents, making him one of the most highly cited biologists in the world. He is most famous for his research on the opioid receptor, for which he received the Albert Lasker Award for Basic Medical Research in 1978. As of October 2018, Snyder is the most cited researcher (by h-index), according to Google Scholar Citations public profiles.