Epimerization 6 article 6 epimerization 6 priority journal 6 chemical structure 4 electron transport 4 lactone derivative 4 oxidation 4 reaction analysis 4 review 4 stereochemistry 4 unclassified drug 4 1 deoxy 3,4 o isopropylidene 6 o (tert butyldiphenylsilyl)erythrohexo 2,5 diulose 2 1 deoxy 3,4 o isopropylidene 6 o tritylerythrohexo 2,5 diulose 2 1,3 butadiene derivative 2 1,4 dicarbonyl 2,3 o isopropylidene derivative 2 2D-NMR spectroscopy 2 6beta,7beta,15beta,16beta dimethylene 11alpha hydroxy 3 oxo 17alpha pregn 4 en 21,17 carbolactone 2 6beta,7beta,15beta,16beta dimethylene 11alpha hydroxy 3 oxo 17beta pregn 4 en 21,17 carbolactone 2 6beta,7beta,15beta,16beta dimethylene 11beta hydroxy 3 oxo 17alpha pregn 4 en 21,17 carbolactone 2 6beta,7beta,15beta,16beta dimethylene 2beta hydroxy 3 oxo 17alpha pregn 4 en 21,17 carbolactone 2 Absidia 2 Absidia corymbifera 2 Acetylation 2 Agitation speed 2 Alkalinity 2 Biotransformation 2 Candida 2 Candida aphidicola 2 Carbohydrates 2