Title: Cyclic sulphur compounds

Abstract: Certain tricyclic thioxanthone-10,10-dioxide compounds each of which is substituted in the 1-,2-,3- or 4-position by a carboxyl or (5-tetrazolyl) group and each of which is optionally substituted in the 5-,6-,7- or 8-position by a second carboxyl or (5-tetrazolyl) group or a substituent selected from cyano, halogen, nitro, alkyl, alkoxy, acyl, amino, acylamino, thioalkyl, alkylsulphinyl and alkylsulphonyl, as well as salts, and optionally substituted esters and amides of the carboxyl substituted compounds and alkyl derivatives of the tetrazolyl substituted compounds, are useful for the relief or prophylaxis of allergic conditions.

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Inventors: Hodson, Harold Francis (Hayes, EN)
Batchelor, John Frederick (Beckenham, EN)

Application Number: 586426
Filing Date: 1975-06-12
Publication_date: 1977-03-15
Assignee: Burroughs Wellcome Co. (Raleigh, NC)
Primary Class(es): 424/46 424/45, 514/382, 514/826
Other Classes:
US Patent Ref:

3706768

Dec, 1972

Bays

260/308.

Other Refs:
Primary Examiner: Waddell, Frederick E.
Assistant Examiner:
Attorney: