'Molly', a purer form of ecstasy or MDMA has allegedly killed two people at a New York City dance festival on Labor Day, according to the Science World Report.
The two individuals, Olivia Rotondo, 20 and Jeffrey Russ 23 died after an overdose from the drug.
Promoters of the event decided to shut down New York's multi-day Electric Zoo Music Festival as four other guests were reported to have ended up in critical conditions from the consumption of the same drug.
"It raises your body temperature, your heart rate goes up, your blood pressure goes up, and so it does make you more prone to heat stroke," said crime analyst Brad Garrett via ABC News.
The Drug Policy Alliance notes that a typical dose molly or around 100 to 125 milligrams of the drug lasts four to six hours.
Its effects resemble both stimulants and psychedelics, the organization noted. There have been very few adverse effects of the drug - most common of which is hypothermia - a dangerously high increase in body temperature.
When these reactions are combined with dancing and other physical exertion, its effects become more serious. Ecstasy in all of its forms is currently illegal in the United States.