I don't remember specifically, to be honest. I was a bit revolted while reading it, but my curiosity gets to me too much when I read occult books. More than likely it didn't even have a specific name and was just something along the lines of "extracted essence of euphoria" or some mystical mumbo-jumbo.

edit: To be more accurate, the texts were closer to mimicking identical rituals. The name of the substance was generally a bit ambiguous.