| 摘要 |
A method for treating a subject having an ulcer or radiation fibrosis. The method includes topically administrating to the subject an effective amount of a compound of the formula: R1 and R2, independently, is H or C1~C6 alkyl; R3 is aryl or heteroaryl; and n is 0, 1, 2, 3, 4, 5, or 6.
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