Patent ID: 6881730

Claim:
Compounds of formula (I) in which: R 1 and R 2 , which may be the same or different, each represents a lower alkyl,alkenyl or alkynyl group; R 3 represents a methyl group having α- or β-configuration; R 4 represents a hydrogen atom or an etherifying or esterifying group; R 5 represents a hydrogen atom, a hydroxyl group or a lower alkoxy group; X represents a group OR 4 , wherein R 4 is as defined above, or a group NR 6 R 7 wherein R 6 represents a hydrogen atom, an aliphatic or arallphatic organic group, or an acyl group comprising an aliphatic, araliphatic or aryl organic group linked to the nitrogen atom by way of a carbonyl group; and R 7 is a hydrogen atom or a lower alkyl group; Y represents a lower alkylene, alkenylene or alkynylene group optionally substituted by a hydroxyl, etherified hydroxyl or esterified hydroxyl group; and the dotted lines signify that double bonds may be present at the 16(17)-position and/or either at the 6(7)- and 8(9)-positions or at the 7(8)-position.