1,8-dihydroxy-9-anthrones for treating warts or psoriasis
Patent 4866095 Issued on September 12, 1989. Estimated Expiration Date: 
September 12, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 12, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References9,10-Dihydro-1,8,9-trihydroxy-9,10-anthracene ,ଲ-endosuccinimide,,ଲ-endosuccinic acid and ଲ-endomaleic acid and derivative thereof 1,8-Dihydroxy-9-anthrones derivatives substituted in the 10-position by an unsaturated radical used in human medicine Pharmaceutical uses of substituted 6(5,6,7,8)tetrahydro-5,5,8,8-tetramethyl-2-naphthyl)-2-naphthoic acid and its esters Benzonaphthalene derivatives and compositions Patent #: 4717720 InventorsApplicationNo. 06/668978 filed on 11/07/1984US Classes:514/569Polycyclo ring systemExaminersPrimary: Daus, Donald G.Attorney, Agent or FirmInternational ClassesC07D 209/00 (20060101)C07D 209/58 (20060101) C07C 62/00 (20060101) C07C 62/32 (20060101) Foreign Application Priority Data1980-10-21 FRAbstractThe invention concerns adducts of 1,8-dihydroxy-9-anthrone, of formula: ##STR1## in which: R1 and R2, taken together, form one of the following divalent residues: ##STR2## R3, R4, R'4, R5 and R'5 representing H, an alkyl group having 1-8 C with the exception of R5 =R'5 =CH3, a monohydroxyalkyl group with 2-8 C, possibly interrupted by one or more oxygens, a cycloalkyl group having 4-6 C, a phenyl group, or a benzyl group.Utilization of the compounds (I) in human or veterinary medicine, in particular in the treatment of psoriasis and or warts, and in cosmetics.Other References
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