The present invention provides a compound comprising a steroidal ring system and an optional group R
1
selected from any one of —OH, a sulphamate group, a phosphonate group, a thiophosphonate group, a sulphonate group or a sulphonamide group; wherein the D ring of the steroidal ring system is substituted by a group R
2
of the formula -L-R
3
, wherein L is an optional linker group and R
3
is selected from groups which are or which comprise one of a nitrite group, an alcohol, an ester, an ether, an amine and an alkene, provided that when R
3
is or comprises an alcohol, L is present; and wherein the A ring of the steroidal ring system is substituted at position 2 or 4 with a group R
4
, wherein R
4
is a hydrocarbyl group.
本发明提供了一种化合物,其包括一个类
固醇环系统和一个可选的基团R1,所述基团R1从以下任一基团中选择:—OH、磺
酰胺基团、
膦酸基团、
硫代
膦酸基团、
磺酸基团或磺
酰胺基团;其中,类
固醇环系统的D环被式为-L-R3的基团R2取代,其中L是可选的连接基团,R3是从以下基团中选择的基团或包含以下基团的基团之一:亚硝基团、醇、
酯、醚、胺和
烯烃,但当R3是或包含醇时,L存在;并且类
固醇环系统的A环在位置2或4处被基团R4取代,其中R4是一个
碳氢基团。