11.beta.-PGE.sub.2 compounds

11.beta.-PGF.sub.2.sub..beta. compounds

11.beta.-Substituted steroids

11.beta.-Substituted-.DELTA..sup.9 -steroids

11a-Homo-PG intermediates for preparing 11a-methano TXA.sub.2 co

11a-Methano TXA.sub.2 amides

11a-Methano-TXA compounds

12'-Iodo derivatives of dimeric indole-dihydroindole alkaloids,

12,13(E)-Didehydro-13,14-dihydro-9,10-didehydro-9-deoxy-PGD.sub.

12,13(E)-Didehydro-13,14-dihydro-9,10-didehydro-9-deoxy-PGD.sub.

12,13(E)-Didehydro-13,14-dihydro-9-deoxy-PGD.sub.1 compounds

12,13(E)-didehydro-13,14-dihydro-9-deoxy-PGD.sub.2 compounds

12,13(E)-didehydro-13,14-dihydro-PGD.sub.1 compounds

12,13(E)-Didehydro-13,14-dihydro-PGD.sub.2 compounds

12-Alkoxy-3,7,11-trimethyl-dodecatetraenes

12-Alkyl-1,4,7,10-tetraazacyclotridecane

12-Anti and syn-(N-benzyl-N-alkylaminomethyl)-10,11-dihydro-5,10

12-Dehydro digoxin-4'"-and 3'"-alkyl ethers

12.alpha.-substituted pregna-1,4-diene-3,20-diones

12A-Deoxy chelocardin