Does the subject want to ask "what kind of xylitol is declared by Australian Customs"? Alcohol. Australian Customs declared that xylitol belongs to alcohol. Xylitol is an organic compound with the chemical formula of C5H 12O5. It originated in Finland and is a natural sweetener extracted from birch, oak, corncob, bagasse and other plant materials. In nature, xylitol is widely distributed in various fruits, vegetables and grains, but its content is very low.