4-[5(R)-Alkyl(or alkenyl)-4(S)-quinuclidin-2(S) or 2(R)-ylcarbon

4-[6-(4-Cyanophenoxy)hexyl]-3,5-heptanedione

4-[[(Amidomethyl)oxy]methyl]-2-oxo-1-azetidinesulfonic acid salt

4-{[4-(Diphenylmethyl)-1-piperidinyl]methyl}benzenamines

4.5-Cis-didehydro-PGB.sub.1 analogs

4.alpha.,6-Dihydroxy-2.alpha.-hydroxy-methyl-3.beta.-tetrahydrop

4.alpha.,6-Dihydroxy-2.beta.-carboxaldehyde-3.alpha.-tetrahydrop

4.alpha.,6-Dihydroxy-5-iodo-2.beta .-aryloxymethyl-3.alpha.-tetr

4.alpha.-Hydroxy-6-oxo-2.beta.- arylmethoxy-methyl-3.alpha.-tetr

4H-1,3-benzoxazin-2-one-3-acetohydroxamic acid derivatives

4H-pyrano[4,3-d]thiazole derivatives and process therefor

4H-Pyrido[3,2a]-1,3,2-dioxophosphorane derivatives

4H-S-Triazolo[4,3-2][1,5]benzodiazepin-5-ones

4H-s-triazolo[4,3-a][1,5]benzodiazepin-5-ones

4H-Thieno-[3,2-b][1]-benzazepines

4H-Thieno[3,4-b][1,4]benzodiazepines

4R-Amino-1t-phenyl-1c-ethoxy-carbonylcyclohexenes-(2) and proces