| 摘要 |
Compounds of the formula: wherein R2 and X are as described, are disclosed. The compounds are useful for treating dermatological disorders which are accompanied by epithelial lesions, e.g., acne and psoriasis, as well as malignant and premalignant epithelial lesions, tumours and precancerous changes of the mucous membrane in the mouth, tongue, larynx, oesophagus, bladder, cervix and colon.
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