Authorities say the chemicals were so strong that four police officers handling them were overcome by the noxious fumes.
One officer had to be transported to hospital with heart palpitations and blood-pressure irregularities even though he was wearing a mask during the bust.
The chemicals included desmethyl fentanyl, a derivative of fentanyl, a powerful painkiller.
Police told a news conference they also seized marijuana, ecstasy, hashish and Viagra during seven raids in late April.
Two people have been arrested and are being detained until their next court appearance.
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