Hyvroxilated quint-ethyl metacetamin is an anesthetic.
When consumed in quantities of seventeen milligrams in about a half-litre of water (approximately 30 to 40 ppm), it would render a human barely able to stand.
In 2370, Quark tried to fix a racquetball match between Julian Bashir and Miles O'Brien by attempting to doping the doctor with a herbal beverage adulterated with this substance. Bashir was unamused. (DS9: "Rivals")