Pharmaceutically useful sulfur containing heterocyclic derivatives

A method of treating conditions of delayed hypersensitivity which comprises administering to a patient in need thereof a compound selected from the formula ##SPC8##

• wherein X is selected from a bond, --CH.sub.2 --, or oxygen;
• each Y is selected from a vinylene group, ##EQU7## carbonyl, oxygen, divalent sulfur, or carbonyloxy with the proviso that when Y is selected from oxygen, divalent sulfur or carbonyloxy, X is a bond;
• A is selected from a straight or branched alkylene chain of from 1 to 6 carbon atoms with the proviso that when Y is a vinylene group, A contains from 1 to 5 carbon atoms and with the proviso that when Y is carbonyloxy, A contains from 2 to 6 carbon atoms;
• each R.sup.1 and R.sup.2 is selected from hydrogen, a straight or branched alkyl group of from 1 to 4 carbon atoms, or alkenyl of 3 to 6 carbon atoms having the vinyl unsaturation in other than the 1-position;
• and pharmaceutically acceptable acid addition salts thereof, in an amount effective to suppress delayed hypersensitivity.