2-¬4-¬(4,4-dialkyl-2,6-piperidinedion-1-...

2-¬¬(4-ethoxy-6 methylamino-1,3,5-triazin-2-yl)...

2.4-dihalogen-6-(c2-c3-alkyl)-phenyl substituted tetramic...

2.beta.-chloromethyl-2.alpha.-methylpenam-3.alpha.-carboxyli...

2.beta.-chloromethyl-2.alpha.-methylpenam-3.alpha.-carboxyli...

2.beta.-chloromethyl-2.alpha.-methylpenom-3.alpha.-carboxyli...

2.beta.-substituted thiomethylpenicillin derivatives and...

2.beta.-substituted-methyl-penicillanic acid derivatives,...

20'-hydroxyvinblastine and related compounds

20, 21-dinoreburnamenine substituted derivatives,...

20,21-dinoreburnamenin derivatives substituted in c-15 by an...

20-0-acylmaytansinoids

20-hydroxyeicosatetraenoic acid production inhibitors

20-methyl-13,14-didehydro-pg1.sub.2 derivatives and process...

21-deoxymacbecin analogues useful as antitumor agents

23-deoxy derivatives of ll-f28249 compounds

23-deoxy-27-halo(chloro or bromo) derivatives of ll-f28249...

23-imino derivatives of 23-keto compounds

23-oxo (keto) and 23-imino derivatives of ll-f28249 compounds

23-oxo (keto) and 23-imino derivatives of mono- and diepoxy...