American Home Products Corporation

Steven K Vernon

Timothy D Ocain

Katherine L Molnar-Kimber

John J Huang

A compound of the structure ##STR1## R.sup.1 and R.sup.2 are each, independently, hydrogen or ##STR2## X is ##STR3## Y is ##STR4## Z is --CH.sub.2 --, --S--S--, or ##STR5## R.sup.3 is hydrogen, alkyl, arylalkyl, alkenyl, alkynyl, --(CH.sub.2).sub.q CO.sub.2 R.sup.5, --(CH.sub.2).sub.r NR.sup.6 R.sup.7, carbamylalkyl, aminoalkyl, hydroxyalkyl, guanylalkyl, mercaptoalkyl, alkylthioalkyl, indolylmethyl, hydroxyphenylmethyl, imidazoylmethyl, halo, trifluoromethyl, or phenyl which is optionally mono-, di-, or tri-substituted;

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Havertown, PA, United States of America

Steven K Vernon