Me Me -Me 汪猷 HO Heinrich Otto Wieland Structure for Ergsterol 1932 Me Me Et M -Me -Me Me re for Cholesterol HO ndaus 1927 Structure for Cholesterol 1932 23 Structure Elucidation What is the procedure? How many methods? Advantages and limitation of every method? 212 23 Me Me Me Me OH Et Me Me Me Me Me HO H H Me Me Me Me Me HO H H H Structure for Cholesterol Wieland/Windaus 1927 Structure for Ergsterol 1932 Structure for Cholesterol 1932 Heinrich Otto Wieland 汪猷 24 Structure Elucidation Structure Elucidation What is the procedure? How many methods? Advantages and limitation of every method?