Sulfonamido containing carboxylic acids

A compound of formula I ##STR3## wherein R.sup.1 denotes straight-chain or branched-chain, saturated or olefinically or acetylenically unsaturated alkyl of from 1 to 18 or 3 to 18 carbon atoms respectively, corresponding alkyl substituted by a methoxy or ethoxy group, cycloalkyl of from 5 to 12 ring members, phenyl, phenyl substituted by C.sub.1-3 alkyl, methoxy or ethoxy groups or halogen atoms, or phenylalkyl of from 1 to 5 carbon atoms in the alkyl group, R.sup.2 denotes hydrogen or R.sup.1, R.sup.1 and R.sup.2 form, together with the nitrogen atoms, a piperidine, pyrrolidine or morpholine ring, R.sup.3 denotes alkylene of from 2 to 5 carbon atoms, and X.sup.+ denotes an alkali metal or ammonium cation or proton.