May 24, 2021
Take me to make others’ voices sound lower.
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Image of N,N-Diisopropyltryptamine 3D Image of N,N-Diisopropyltryptamine

N,N-Diisopropyltryptamine (commonly abbreviated as DiPT) is a synthetic hallucinogenic substance. It is a derivative of the amino acid tryptophan and is closely related to the naturally occurring and widely banned N,N-dimethyltryptamine1 (DMT), the Molecule of the Week for September 17, 2018.

American biochemist Alexander T. Shulgin, the so-called “godfather of psychedelics”, synthesized and experimented with DiPT as early as 1980. His 1997 book TIHKAL2: The Continuation, coauthored with his wife Ann, described their research, including their own experiences, with DiPT and other tryptamine derivatives.

Shulgin published two methods for synthesizing DiPT as its hydrochloride. In the first, he combined indole with oxalyl chloride to form an acyl chloride intermediate, which was treated with diisopropylamine to form indol-3-yl-N,N-diisopropylglyoxylamide. This product was then reduced with lithium aluminum hydride to form DiPTHCl.

In the second, more direct, synthesis, Shulgin treated tryptamine with isopropyl iodide in the presence of a tertiary amine. The crude free base DiPT was acidified with anhydrous hydrogen chloride to form the HCl salt.

The same article goes on to describe DiPT’s hallucinogenic effects. DiPT is unlike all other psychedelic substances in that it produces primarily auditory effects. At moderate to high doses, it lowers the pitch of perceived sounds. In Shulgin’s experience when he ingested 25 mg:

My wife’s voice is basso, as if she had a cold—my ears with slight pressure as if my tubes were clogged but they aren’t. Radio voices are all low, music out of key. Piano sounds like a bar-room disaster. The telephone ringing sounds partly underwater. In a couple more hours, music pretty much normal again.

DiPT is not a scheduled controlled substance in the United States, although its 5-methoxy derivative (aka “foxy methoxy”) is illegal. Possession of DiPT, however, could possibly be prosecuted under the Federal Analogue Act.

1. DMT continues to be studied as a replacement for side effect–prone ketamine for treating severe depression
2. Abbreviation for “Tryptamines I Have Known and Loved”.

N,N-Diisopropyltryptamine hazard information

Hazard class*Hazard statement
Acute toxicity, oral, category 4H302—Harmful if swallowedChemical Safety Warning
Acute toxicity, dermal, category 4H312—Harmful in contact with skinChemical Safety Warning
Acute toxicity, inhalation, category 4H332—Harmful if inhaledChemical Safety Warning

*Globally Harmonized System of Classification and Labeling of Chemicals.  
Explanation of pictograms.

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fast facts

CAS Reg. No.14780-24-6
1H-Indole-3-ethanamine, N,N-bis(1-methylethyl)-
Empirical formulaC16H24N2
Molar mass244.38 g/mol
AppearanceWhite crystalline solid
Melting point46 ºC
Water solubility≈14 g/L (est)

MOTW update

Titanium dioxide (TiO2) was the Molecule of the Week for June 27, 2005. For decades it has been widely used for its brilliant, reflective whiteness in applications ranging from paints to sunscreens. Although it has long been thought to be safe as a food and toothpaste ingredient, recent studies revealed it to be a possible carcinogen. This month, a panel of the European Food Safety Authority reported that TiO2 could not be ruled out as a genotoxin. It is expected that the European Union will soon ban it as a food additive.

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