Wiktionary
dipropyltryptamine
n. A particular psychedelic tryptamine drug.
Wikipedia
Dipropyltryptamine
N,N-Dipropyltryptamine (DPT, also known as "The Light") is a psychedelic drug belonging to the tryptamine family, first reported in 1973. It is found either as its crystalline hydrochloride salt or as an oily or crystalline base. It has not been found to occur naturally. It is a close structural homologue of dimethyltryptamine.
Frequent physical effects are nausea, numbness of the tongue or throat, and pupil dilation.