Which medical term means an abnormal increase in the forward curvature of the lower or lumbar spine? - 4684768
The molecular structure of caffeine. Caffeine belongs to the family of heterocyclic compounds known as purines. It has the systematic name 3,7-dihydro-1,3,7-trimethyl-1H-purine-2,6-dione; it is also known as 1,3,7-trimethylxanthine, and 1,3,7-trimethyl-2,6-dioxopurine.
The names  caffeine  and  3,7-dihydro-1,3,7-trimethyl-1H-purine-2,6-dione  both signify the same chemical. The systematic name encodes the structure and composition of the caffeine molecule in some detail, and provides an unambiguous reference to this compound, whereas the name caffeine just names it.