Summary The'basic cleavage product (11) gives on oxidation an acid C4H4NS-COOH identical with the product obtained by Windaus directly from the vitamin. Evidence is presented for regarding (11) as a tertiary heterocyclic base with a P-hydroxyethyl side chain C4HdNS-CH2CH20H. Evidence is presented consistent with the view that the vitamin is a quaternary salt of the base (11). NEW YORK, N. Y. RECEIVED JULY 11, 1933 ... (14) “Identification of Pure Organic ...