histan
Histan refers to a hypothetical class of organic compounds that are structurally related to histamine. In biological systems, histamine is a well-known biogenic amine involved in immune responses, neurotransmission, and regulation of physiological functions. Compounds classified as histans would share a similar imidazole ring and ethylamine side chain, but with variations in substituents or the core structure that would alter their pharmacological or biochemical properties compared to endogenous histamine.
Research into histan-like compounds often focuses on their potential as agonists or antagonists of histamine receptors.