Elemicin (3,4,5-trimethoxyallylbenzene) - a natural organic compound that is a constituent of the essential oil of nutmeg. It is believed to be partially responsible for the subtle psychoactive effects of nutmeg.
References
"Chemistry and psychopharmacology of nutmeg and of several related phenylisopropylamines." Shulgin, Alexander T.; Sargent, Thornton W.; Naranjo, Claudio. United States, Public Health Service Publication (1967), No. 1645 202-14.