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'Such a waste of a beautiful life': Pharmacist died after taking deadly drug combination at Stereosonic

The woman who died at Stereosonic reportedly took a mix of ecstasy and MDMA mixed together in a bottle of water which led to her death.

Sylvia Choi, 25, was a qualified pharmacist from Oyster Bay and collapsed just minutes after taking the drug concoction at Stereosonic music festival at Sydney's Olympic Park.

Sylvia Choi, 25, went into cardiac arrest after taking the drug concotion. Photo: NSW Police

The young woman went into cardiac arrest after taking the deadly mixture and later died at Concord Hospital at 9.30 on Saturday night, say reports.

Ms Choi’s school friend Aimee Herbert told Daily Mail Sylvia was a smart girl who would ‘go far in life’.

“She was a talented and amazingly kind girl and I cannot believe that this would ever happen to her,” she said.

“It's such a waste of a beautiful life.”

Ms Choi graduated school at Gymea Technology High School in 2007 and studied at the University of Sydney before beginning her career as a pharmacist.

“I went to school with Sylvia. I cannot comprehend this. She was amazing and so smart and talented and I am in utter shock. Rest In Peace, Sylvo,” Ms Herbert said.

Phil Smith, the CEO of Blooms The Chemist said in a statement Ms Choi was ‘one of our bright, well-respected and highly professional pharmacists’.

“We extend our deepest condolences to Ms Choi’s family and ask the broader community to respect their privacy during this difficult time,” he said.

A friend staying with the family told Daily Mail Ms Choi's parents and siblings were very distressed over her death.

The tragedy comes as another woman was placed in an induced coma on Saturday after attending the festival.

A 22-year-old woman from the UK was taken to Westmead Hospital in a critical condition.

It was announced on Sunday morning that her condition had been upgraded to stable.

A further nine people were taken to hospital for treatment and later discharged.

Meanwhile, 69 people were charged with with possessing and supplying drugs, a number police said was "alarming and disappointing".

Thousands swarmed Sydney's Olympic Park for the Stereosonic music festival on Saturday. Photo: Twitter/Rachael MadiganSmith

South West Assistant Commissioner Frank Mennilli said the message doesn't see to get through to some people.

"These drugs are made by criminals in back yards," Mr Menilli said, according to The Daily Telegraph.

"It's like opening a bottle of bleach and swallowing it."

The organisers behind Stereosonic have appealed to their audiences 'to stay safe and look out for each other' in a statement released on social media.

"Totem Onelove conveys our deepest condolences to the friends and family of the patron who tragically passed away on Saturday night at Sydney Stereosonic. As it is a matter with the NSW Police and Coroner we cannot make any further statements or comment," the official Facebook page said.

Earlier, a 21-year-old man was caught trying to stash drugs in Sydney Olympic Park before the festival.

Police were called on Friday after a man was "allegedly observed damaging a building with a drill", police said.

NSW Police Inspector Chris Laid told Fairfax a man was attempting to "install something [in the building] that could conceal drugs."

The man fled the scene and police later charged him after finding 10 MDMA pills in his home.

Bands play at Stereosonic. Photo: Twitter/Harts

Mr Mennilli said more police would have made little difference in combating drug use.

"I can honestly tell you that if I had more police dogs and more police, it'd just result in more people being arrested," he said.

"The party drugs available at music festivals were especially dangerous given their 'home-made' production.

NSW Police officers stopping the White Coats Muslim charity group from heading to Stereosonic on Saturday. Source: 7 News

"They're cooked up in backyards. You just don't know what impurities are put in these drugs," he said.

More than 48,000 people were packed together at the event.

Meanwhile, police stopped a Muslim charity group known as the White Coats from attending the festival, with a large number of officers stopping their van in Lidcombe in what witnessed described as a war zone.

Two patrol cars pulled the group's minibus over. The charity group said they were headed to the festival to carry an anti-drug message to young people.

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