Novel sulfam(na)phthaleins

A compound of the formula ##STR27## wherein R.sup.1 and R.sup.2 each are selected from hydrogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms, chloro and fluoro;

• R.sup.3 is hydrogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms or hydroxy;
• R.sup.2 and R.sup.3 taken together represent the carbon atoms necessary to complete a fused benzene ring;
• R.sup.4 and R.sup.6 each are selected from hydrogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms, chloro and fluoro;
• R.sup.7 is hydrogen, hydroxy, alkyl having 1 to 4 carbon atoms or alkoxy having 1 to 4 carbon atoms;
• R.sup.6 and R.sup.7 taken together represent the carbon atoms necessary to complete a fused benzene ring provided R.sup.2 and R.sup.3 are taken separately when R.sup.6 and R.sup.7 are taken together;
• R.sup.5 is selected from hydrogen, hydroxy, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms, --N,N-(dialkyl)amino wherein each alkyl contains 1 to 4 carbon atoms, --N,N-(w-R.sup.8 alkyl).sub.2 amino wherein R.sup.8 is hydroxy or halo and said alkyl contains 1 to 4 carbon atoms, --NHCOCH.sub.3, piperidino, pyrrolidino, N-methylpiperazino, morpholino, thiomorpholino or tetrahydro-2H,4H-1,3,6-dioxazocino;
• R.sup.4, R.sup.5 and R.sup.6 taken together represent the atoms necessary to complete a fused quinolizidine ring;
• X represents the atoms necessary to complete 2,3-dihydrobenzisothiazole-1,1-dioxide or 2,3-dihydronaphtho-1,2-thiazine-1,1-dioxide;
• and R.sup.9 is selected from lower alkyl having 1 to 4 carbon atoms and phenyl, unsubstituted or substituted with at least one electron-withdrawing group having a positive sigma value as defined by Hammett's Equation selected from the group consisting of fluoro, chloro, bromo, cyano, --SO.sub.2 CH.sub.3, ##STR28## and --COCH.sub.3.