optionally substituted phenyl includes phenyl and phenyl substituted once or twice with c 1 c 6 alkyl c 1 c 4 alkoxy hydroxy nitro chloro fluoro or tri chloro or fluoro methyl the compounds used in the methods of this invention form pharmaceutically acceptable acid and base addition salts with a wide variety of organic and inorganic acids and bases and include the physiologically acceptable salts which are often used in pharmaceutical chemistry such salts are also part of this invention typical inorganic acids used to form such salts include hydrochloric hydrobromic hydroiodic nitric sulfuric phosphoric hypophosphoric and the like salts derived from organic acids such as aliphatic mono and dicarboxylic acids phenyl substituted alkanoic acids hydroxyalkanoic and hydroxyalkandioic acids aromatic acids aliphatic and aromatic sulfonic acids may also be used such pharmaceutically acceptable salts thus include acetate phenylacetate trifluoroacetate acrylate ascorbate benzoate chlorobenzoate dinitrobenzoate hydroxybenzoate methoxybenzoate methylbenzoate o acetoxybenzoate naphthalene 2 benzoate bromide isobutyrate phenylbutyrate u03b2 hydroxybutyrate butyne 1 4 dioate hexyne 1 4 dioate caprate caprylate chloride cinnamate titrate formate fumarate glycollate heptanoate hippurate lactate malate maleate hydroxymaleate malonate mandelate mesylate nicotinate isonicotinate nitrate oxalate phthalate teraphthalate phosphate monohydrogenphosphate dihydrogenphosphate metaphosphate pyrophosphate propiolate propionate phenylpropionate salicylate sebacate succinate suberate sulfate bisulfate pyrosulfate sulfite bisulfite sulfonate benzene sulfonate p.