Any number of other unscheduled synthetic cannabinoids pulled from the depths of research papers or made by enterprising Chinese chemists. Either way it's still Russian roulette with whatever you're getting.
They have a "Lab Reports" section on their website but I am not able to access it right now for some reason. I just get a blank page when I click on the link. Supposedly you can ask for the ingredients in some stores that sell it.
Where did it say there was no cannabinoids in it? My assumption would be that it does indeed contain some sort of synthetic cannabinoids.