2.beta.-Chloromethyl-2.alpha.-methylpenam-3.alpha.-carboxylic ac
20'-Hydroxyvinblastine and related compounds
20-Cyano-20,21-epoxy steroids
20-Isocyano-.DELTA..sup.17(20) -steroids
20-O-Acylmaytansinoids
20.beta.,21-Epoxy-3.alpha.-hydroxy-5.alpha.-pregnanes and deriva
20/22/23/24-Oxa-7-oxocholesterols and esters thereof
21,21-Dihalo steroids
21-(Acetyloxy)-3-oxo-24-norchola-4,20(22)-diene-23-nitrile and i
21-Deoxydihydroajmaline derivatives
22-Cyano-24-norcholanes
22-Cyano-24-norcholanes
23,23-Difluoro-1.alpha.,25-dihydroxy-vitamin D.sub.3
23,23-Difluoro-1.alpha.,25-dihydroxy-vitamin D.sub.3
23,23-Difluoro-25-hydroxy-vitamin D.sub.3 and process for prepar
23,23-Difluoro-25-hydroxy-vitamin D.sub.3 and process for prepar
23,25-Dihydroxyvitamin D.sub.3
23-Dehydro-25-hydroxyvitamin D.sub.3
23-Hydroxy-3-oxo-24-norchola-4,17(20)-dien-21-oic acid .gamma.-l
24,24-Difluoro-1.alpha.,25-dihydroxycholecalciferol