GB9910934D0 — Chemical compounds

USPTO Abstract

Formula (I) in which: R<SUP>1 </SUP>and R<SUP>2</SUP>, which may be the same or different, each represents a lower alkyl, alkenyl or alkynyl group; R<SUP>3 </SUP>represents a methyl group having alpha- or beta-configuration; R<SUP>4 </SUP>represents a hydrogen atom or an etherifying or esterifying group; R<SUP>5 </SUP>represents a hydrogen atom, a hydroxyl group or a lower alkoxy group; X represents a group OR<SUP>4</SUP>, or a group NR<SUP>6</SUP>R<SUP>7 </SUP>wherein R<SUP>6 </SUP>represents a hydrogen atom, an aliphatic or araliphatic group, or an acyl group comprising an aliphatic, araliphatic or aryl group linked to the nitrogen atom by way of a carbonyl group; and R<SUP>7 </SUP>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; exhibit potent effects on modulation of cell growth and differentiation, while having low calcaemic activity.