Methods for treatment of fibrotic diseases using compounds of formula Iwherein RA is hydrogen,R7 and R8 are independently selected from H and SO2NR3R4,one of R7 and R8 is hydrogen, andR1, R2, R3, and R4 are each independently selected from H, alkyl, heteroalkyl, cycloalkyl, arylcycloalkyl, aryl, heteroaryl, heterocycloalkyl, and each of NR1R2 and NR3R4 can independently combine to form a heterocycloalkyl, and wherein said alkyl, heteroalkyl, cycloalkyl, arylcycloalkyl, aryl, heteroaryl, or heterocycloalkyl may be optionally substituted,or a pharmaceutically acceptable salt, ester, amide, stereoisomer, geometric isomer or prodrug thereof.
