The present invention pertains to compounds of general formula (I)
wherein R
1
, R
2
, R
3
, and R
4
denote hydrogen or sulfate monoester with the proviso that R
1
, R
2
, R
3
, and R
4
cannot simultaneously represent hydrogen, processes for their preparation and their use as pharmaceuticals.
本发明涉及一般式(I)的化合物,其中R1、R2、R3和R4表示氢或
硫酸单酯,但R1、R2、R3和R4不能同时表示氢,其制备过程以及它们作为药物的用途。