36 year old Ricardo MacQueen De Aguiar was also found guilty of two counts of assault on ana emergency worker.
De Aguiar pleaded guilty to all of the charges against him.
Historically GBL had been difficult to prove as an illegal drug due to its use as an industrial solvent.
Detective Constable Eoghan O’Neil, who led the investigation, said: “I’m proud of the dedicated detectives who dug deep into the vast amount of data seized as part of this investigation – their professional curiosity led us to building a robust case against De Aguiar and ultimately helped to take this dangerous man off our streets.
“We know it can be difficult to talk about issues around GBL and drug misuse in sex, but ultimately it’s our jobs at police officers to keep Londoners safe. We will always pursue those who put the lives of others at risk.”
