Synthale was a type of drink made by a number of cultures. One type was voodai.

The beverage had none of the effects of real liquors. (DS9 novel: The Long Night)

Quark sold Bajoran synthale at his bar on Deep Space 9, though he didn't think very highly of it, describing it as "dreadful" when Benjamin Sisko enquired about the local variety in 2369. (DS9 episode: "Emissary")

Odo accused Quark of watering down synthale, but Quark claimed he was trying to make it lighter and less filling. (DS9 novel: Warped)

A variety of synthale was available from the Ten-Forward bar on USS Enterprise-E in 2376 which Deanna Troi was drinking when she talked to Elias Vaughn about his recent orb experience. (DS9 novel: Avatar, Book One)