Abstract: The present invention provides a compound comprising a steroidal ring system and an optional group R1 selected from any one of —OH, a sulphamate group, a phosphonate group, a thiophosphonate group, a sulphonate group or a sulphonamide group; wherein the A ring of the steroidal ring system is optionally substituted at position 2 or 4 with a group R4 which may be a suitable subtituent, wherein the D ring of the steroidal ring system is substituted by a group R2 of the formula -L-R3, wherein L is an optional linker group and R3 is selected from groups which are or which comprise one of (i) —SO2R5, wherein R5 is H, a hydrocarbyl group or a bond or group attached to the D ring; (ii) —NO2; (iii) —SOR6, wherein R6 is H or a hydrocarbyl group; (iv) —R7, wherein R7 is a halogen; (v) -alkyl; (vi) —C(?O)R3, wherein R3 is H or hydrocarbyl; (vii) —C?CR9, wherein R9 is H or hydrocarbyl; (viii) —OC(?O)NR10R11 wherein R10 and R11 are independently selected from H and hydrocarbyl; (ix), (x), (xi), (xii) and (xiii) are formula

Abstract: There is provided a compound having Formula (I) wherein G is H or a substituent, and wherein R1 is any one of a sulphamate group, a phosphonate group, a thiophosphonate group, a sulphonate group or a sulphonamide group, capable of inhibiting steroid sulphatase.

Abstract: There is provided a compound of Formula (I) wherein (I) R2 is selected from (i) an alkyloxyalkyl group (ii) a nitrile group, and wherein R2 is capable of forming a hydrogen bond (iii) alkylaryl group, wherein the aryl group is substituted by other than a C1-10 group (iv) alkenylaryl group wherein the aryl group is substituted (v) alkylheteroaryl group, wherein when heteroaryl group comprises only C and N in the ring, the aryl group is substituted by other than a methyl group (vi) alkenylheteroaryl group, (vii) ?N—O-alkyl or ?N—O—H group (viii) branched alkenyl (ix) alkyl-alcohol group (x) amide or alkylamide wherein (a) the alkyl of the alkylamide is —CH2— or —Ch2Ch2—, (b) the amide is di-substituted and/or (c) the amide is substituted with at least one of alkyl heterocycle group, alkenyl heterocycle group, alkylheteroaryl group, alkenylheteroaryl group, heteroaryl group, alkylamine group, alkyloxyalkyl group, alkylaryl group, straight or branched alkyl group, (xi) —CHO so that R1 together with R3 provide the

Abstract: A method of inhibiting steroid sulphatase activity in a subject in need of same is described.

Abstract: A method of inhibiting steroid sulphatase activity in a subject in need of same as described. The method comprises administering to said subject a steroid sulphatase inhibiting amount of a ring system compound; which ring system compound comprises a ring to which is attached a sulphamate group of the formula wherein each of R1 and R2 is independently selected from H, alkyl, alkenyl, cycloalkyl and aryl, or together represent alkylene optionally containing one or more hetero atoms or groups in the alkylene chain; and wherein said compound is an inhibitor of an enzyme having steroid sulphatase activity (E.C.3.1.6.2); and if the sulphamate group of said compound is replaced with a sulphate group to form a sulphate compound and incubated with a steroid sulphatase enzyme (E.C.3.1.6.2) at a pH 7.4 and 37° C. it would provide a Km value of less than 50 &mgr;M.