ITS current street name is Green Rolex, but the toxic substance in the deadly fake ecstasy pills that has led to the recent deaths of seven young Scots has been a killer since 2002.
It is thought there have been dozens of deaths involving the stimulant para-methoxyamphetamine (PMA) in "party pills" over the past decade, with cases more apparent in the last two years.
The deaths of seven Scots and eight people in Northern Ireland have been linked to the Green Rolex pills, which have bear a crown or castle logo.
But fake ecstasy containing PMA has been around in different guises for 11 years. Its street names have included Dr Death, Mitsubishi Turbos, Green Apple, Pink Ecstasy or Pink McDonalds.
It has been sold to clubbers for as little as £3 a pill but is five times as strong as normal ecstasy and can cause the body temperature to rise dangerously.
Last week Police Scotland said six people in the west of Scotland, among them Nick Donnelly, 19, of Castlemilk, Glasgow, had died from the green fake ecstasy. That was followed by the death of Demi Campbell, 18, in Alexandria in West Dunbartonshire, on Tuesday who took the fake ecstasy pills.
Six months earlier, football fan Anthony Lennon, 28, from Blantyre, South Lanarkshire, was one of three who died within 24 hours in England.
He collapsed at a guest-house in Liverpool after taking five pills laced with PMA, whose street name was Dr Death. A Liverpool FC fan, he was on Merseyside to watch the side play Norwich.
In nearby Wigan, Gareth Ashton, 28, suffered a heart attack and died after being taken to hospital sweating profusely having taken a pill.
A few miles further east Jordan Chambers, 19, died at Oldham Hospital 24 hours earlier after suffering similar symptoms.
The first case of death from PMA in the UK was recorded in 2002 by a coroner in England where public inquests into drug deaths are conducted.
One of the earliest Scottish cases was that of a 20-year-old who died in September 2011 after taking greenish pills nicknamed Einstein containing PMA.
At the RockNess music festival in June, last year, a teenage boy from Portobello in Edinburgh died after it is believed he took taken a fake ecstasy pill containing PMA.
Last month party-goer Kimberly Bradbury, 24, of Ilkeston in Derbyshiredied after taking a pill believed to be PMA. Two months ago 16-year-old Ellie Jones collapsed and died in Cheshire after suffering breathing problems. Tests indicated she had taken PMA.
In April, oil-rig worker Rachel Clayton and her partner Emma Speed were discovered dead at their home in Macclesfield in April, 2013 having taken PMA.
A 34-year-old-old man found dead in a caravan in the same town two months previously also had traces of PMA in his body.
Travis Barber, 19, from Manchester, died in February after taking half a pink, heart-shaped pill, leading to a police warning about pills contaminated with PMA. Thomas Philip Jones, 19, of Llangefni in North Wales died in hospital in Bangor after a night out, having taken a green pill stamped with an apple. Two other fatalities came in Derbyshire around in December, 2012.
After art student Charlotte Woodiwiss, 20, from Chapel-en-le-Frith, Derbyshire died in December last year, her uncle Matt Woodiwiss left a poignant message on her Facebook page, saying: "I'm devastated by my family's loss. Now our beautiful girl has gone far too early.
"But let this tragic sequence of events teach you a few things. Think long and hard. If you carry on living your lives as so many of you are, you are running the risk of your families being torn apart with grief like mine is."
A day later Dale Yates, 18, from Buxton, Derbyshire, died.
lA 24-year-old man has been charged with supplying drugs following the death of a teenager who took a fake ecstasy tablet.
Barrie Rainey, from Alexandria in West Dunbartonshire, appeared at Dumbarton Sheriff Court.
He was charged with supplying ecstasy and made no plea or declaration before being remanded in custody.
Police have said pills are being sold as ecstasy but which contain toxic chemicals with potentially fatal effects.
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