invention or a pharmaceutically acceptable salt thereof and optional pharmaceutical adjuvants in a carrier such as for example water saline aqueous dextrose glycerol ethanol and the like solubilizing agents and emulsifiers as for example ethyl alcohol isopropyl alcohol ethyl carbonate ethyl acetate benzyl alcohol benzyl benzoate propyleneglycol 1 3 butyleneglycol dimethylformamide oils in particular cottonseed oil groundnut oil corn germ oil olive oil castor oil and sesame oil glycerol tetrahydrofurfuryl alcohol polyethyleneglycols and fatty acid esters of sorbitan or mixtures of these substances and the like to thereby form a solution or suspension suspensions in addition to the active compounds may contain suspending agents as for example ethoxylated isostearyl alcohols polyoxyethylene sorbitol and sorbitan esters microcrystalline cellulose aluminum metahydroxide bentonite agar agar and tragacanth or mixtures of these substances and the like compositions for rectal administrations are for example suppositories that can be prepared by mixing the compounds of the present invention with for example suitable non irritating excipients or carriers such as cocoa butter polyethyleneglycol or a suppository wax which are solid at ordinary temperatures but liquid at body temperature and therefore melt while in a suitable body cavity and release the active component therein dosage forms for topical administration of a compound of this invention include ointments powders sprays and inhalants the active component is admixed under sterile conditions with a physiologically acceptable carrier and any preservatives buffers or propellants as may be required ophthalmic formulations eye ointments powders and solutions are also contemplated as.