Abstract: New 24-oxa derivatives in the vitamin D series of general formula I are described in whichR.sup.1, R.sup.2 and R.sup.5, independently of one another, mean a hydrogen atom or an acyl group with 1 to 9 carbon atoms,R.sup.3 means a hydrogen atom or a linear or branched alkyl group with 1 to 4 carbon atoms andR.sup.4 means a hydrogen atom each or a linear or branched alkyl group each with 1 to 4 carbon atoms.Pharmaceutical preparations which contain these compounds are also disclosed.

Abstract: Nitroimidazoles of the formula ##STR1## wherein R is dialkylaminoacryloyl; 3-, 4-, or 5-pyrazolyl or a mixture thereof which is unsubstituted or substituted by alkyl or, at the 1-position, by hydroxyalkyl or a nitro ester thereof, acyloxyalkyl, nitro, phenyl or phenyl p-substituted by halo, alkoxy or nitro, or, in the 3- or 5-position or a mixture thereof by nitro; 3- or 5-alkyl-4-isooxazolyl or a mixture thereof; or 4-alkyl-5-pyrimidinyl, unsubstituted or substituted by alkyl, amino, 2-furyl or 5-nitro-2-furyl, and the physiologically acceptable acid addition salts thereof, possess anti-protozoal activity, e.g., against trichomonas vaginalis and Entamoeba histolytica.