Diiodo-Z-tyrosine Ethyl Ester Hydrochloride.-Thirty granis of diiodotyrosine prepared* from Merck I-tyrosine was covered with 500 cc. of absolute ethanol and the mixture saturated with dry hydrogen chloride. The fine needles which separated on chilling weighed 20 g. when dry. A sample decomposed at 217-218"(uncor.) with prebroTTning. On recrystallization from five parts of 955;
