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" (Apocynaceae), a medicinal tree of West Africa and in the medicinal/entheogenic shrub Desfontainia spinosa (Columelliaceae) native to Central America and South America.
Biosynthesis.
Loganin is formed from loganic acid by the enzyme loganic acid O-methyltransferase (LAMT). Loganin then becomes a substrate for the enzyme secologanin synthase (SLS) to form secologanin, a secoiridoid monoterpene found as part of ipecac and terpene indole alkaloids.