Theacrine
Theacrine, also known as 1,3,7,9-tetramethyluric acid, is a purine alkaloid found in Cupuaçu ("Theobroma grandiflorum") and in a Chinese tea known as kucha () ("Camellia assamica var. kucha"). It shows anti-inflammatory and analgesic effects and appears to affect adenosine signalling in a manner similar to caffeine. In kucha leaves, theacrine is synthesized from caffeine in what is thought to be a three-step pathway. Similarity to caffeine. Theacrine is similar to caffeine with an additional methyl group in the 9-position, and a carbamide as a result of an additional carbonyl group at the 8-position. Safety. Theacrine  has demonstrated clinical safety and non-habituating effects in healthy humans over 8 weeks of daily use at up to 300 mg/day. Moreover, there was no evidence of tachyphylaxis that is typical of neuroactive agents such as caffeine and other stimulants. In animal studies, theacrine has an LD of 810 mg/kg, compared to 265 mg/kg for caffeine.