9,10-Dihydro-1,8,9-trihydroxy-9,10-anthracene ,ଲ-endosuccinimide,,ଲ-endosuccinic acid and ଲ-endomaleic acid and derivative thereof
Patent 4465688 Issued on August 14, 1984. Estimated Expiration Date: 
June 29, 2002. 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.
June 29, 2002. 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 References 3123618 3678072 InventorsAssigneeApplicationNo. 06/393647 filed on 06/29/1982US Classes:514/410, Polycyclo ring system having the five-membered hetero ring as one of the cyclos548/419, Two of the cyclos share at least three ring members, or a ring carbon is shared by three of the cyclos (e.g., bridged, peri-fused, etc.)560/56, Ortho fused rings in acid moiety562/466Polycyclo ring systemExaminersPrimary: Daus, Donald G.Assistant: Teoli, William A. Jr. Attorney, Agent or FirmInternational ClassesC07D 207/40 (20060101)C07D 207/00 (20060101) C07D 295/185 (20060101) C07C 59/00 (20060101) C07C 59/86 (20060101) C07D 295/00 (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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