A body occurring in small quantity in the juices of
   muscle, in the lungs, and elsewhere, but especially in the bile, where
   it is found as a component part of taurocholic acid, from which it can
   be prepared by decomposition of the acid. It crystallizes in colorless,
   regular six-sided prisms, and is especially characterized by containing
   both nitrogen and sulphur, being chemically amido-isethionic acid,
   C2H7NSO3.