Butyric acid in case anyone is wondering. Literally a product of digestion, so you taste it when you throw up:

Highly-fermentable fiber residues, such as those from resistant starch, oat bran, pectin, and guar are transformed by colonic bacteria into short-chain fatty acids (SCFA) including butyrate, producing more SCFA than less fermentable fibers such as celluloses.[13][21] One study found that resistant starch consistently produces more butyrate than other types of dietary fiber.[22] The production of SCFA from fibers in ruminant animals such as cattle is responsible for the butyrate content of milk and butter.[23]

They literally put vomit flavor in their chocolate!!!