Loganic acid is an

iridoid Iridoids are a type of monoterpenoids in the general form of cyclopentanopyran, found in a wide variety of plants and some animals. They are biosynthetically derived from 8-oxogeranial. Iridoids are typically found in plants as glycosides, mos ...

. Loganic acid is synthesized from

7-deoxyloganic acid 7-Deoxyloganic acid is an iridoid monoterpene. 7-Deoxyloganic acid is produced from 7-deoxyloganetic acid by the enzyme 7-deoxyloganetic acid glucosyltransferase (7-DLGT).Salim, Yu, Altarejos and De Luca (2013) Virus-induced gene silencing iden ...

by the enzyme 7-deoxyloganic acid hydroxylase (7-DLH). It is a substrate for the enzyme

loganate O-methyltransferase In enzymology, a loganate O-methyltransferase () is an enzyme that catalyzes the chemical reaction :S-adenosyl-L-methionine + loganic acid \rightleftharpoons S-adenosyl-L-homocysteine + loganin Thus, the two substrates of this enzyme are S-aden ...

for the production of

loganin Loganin is one of the best-known of the iridoid glycosides. It is named for the Loganiaceae, having first been isolated from the seeds of a member of that plant family, namely those of ''Strychnos nux-vomica''. It also occurs in ''Alstonia boonei' ...

.Dewick (2009) Medicinal Natural Products: A Biosynthetic Approach.

References

Iridoid glycosides Glucosides Carboxylic acids Cyclopentanes {{organic-compound-stub