Lambic "yeast" is either a blend of spontaneous wild yeast and bacteria (the true form in true spontaneously fermented Lambic), or is a balanced culture of various wild yeast and bacteria isolated from traditional Lambic meant to replicate the character of a good spontaneous fermentation.
Point is, there's no such thing as "Lambic yeast", and they can certainly produce compounds other yeasts won't. But all yeasts produce more than just ethanol. Fermentation is a complicated process with a lot of compounds created.
What makes you ask?