Abstract: A process for preparing gamma-L-glutamyl-taurine, which has been found to be effective therapeutically through the control of vitamin A metabolism, which comprises reacting carbobenzyloxy-L-glutaminic acid-.alpha.-benzyl ester with triethylamine and isobutylchloroformate and then treating the reaction mixture with cystamine dihydrochloride to recover N,N'-bis-(N-carbobenzyloxy-gamma-[.alpha.-benzyl]-L-glutamyl)-cystamine. The latter is reacted with hydrogen peroxide in glacial acetic acid to produce carbobenzyloxy-gamma-(.alpha.-benzyl)-L-glutamyl taurine. The latter compound is treated with hydrogen bromide in glacial acetic acid to recover the gamma-(.alpha.-benzyl)-L-glutamyl taurine and this compound is treated with potassium hydroxide solution to yield the gamma-L-glutamyl taurine.

Abstract: The invention relates to novel .omega.-aminocarboxylic acid amides having the formula (I) ##STR1## wherein A is --SO.sub.2 OH or --OPO(OH).sub.2,R.sup.1 is hydrogen, an acyl group, such as benzoyl, arylsulfonyl, alkoxycarbonyl, cycloalkoxycarbonyl or aralkoxycarbonyl group or an aralkoxycarbonyl group having a halogen, alkoxy, nitro, phenylazo or alkoxyphenylazo substituent, alkyl-substituted aryloxycarbonyl or carbonyl,R.sup.2 is hydrogen or a carbonyl group, with the proviso that when R.sup.1 and R.sup.2 each stand for carbonyl, the two carbonyl groups form a ring through an intervening o-phenylene, alkylene or vinylene group when A is --SO.sub.2 OH and R.sup.1 is an acyl group such as benzoyl, aryl sulfonyl, alkoxy-carbonyl, cycloalkoxycarbonyl or aryloxycarbonyl group or an aralkoxy carbonyl group having a halogen, alkoxy, nitro, phenylozo or alkoxyphenylazo substituent or an alkyl-substituted aryloxycarbonyl group or carbonyl group,R.sup.2 is hydrogen or a carbonyl group, with the proviso that when R.

Abstract: Gamma-L-glutamyl cholamine phosphate and beta-L-aspartyl cholamine phosphates are disclosed, the compounds having blood-sugar-level lowering and serum vitamin A increasing effect.

Abstract: Compounds of the formula: ##STR1## or pharmaceutically acceptable salts thereof, wherein: A is --OPO(OH).sub.2 ;R.sup.1 is hydrogen, acetyl or benzoyl;R.sup.2 is hydrogen; andn is 2 or 3 with the ability to decrease blood sugar are disclosed.