| abstract |
Compounds of the formula (I), (II) or (III) are provided, wherein X1, X2 and X3 are independently selected from H and hydroxy protecting groups R1 and R2 are independently selected from H or straight or branched chain alkyl groups having 1 to 8 carbon atoms, straight or branched chain alkenyl groups having 2 to 8 carbon atoms, substituted straight or branched chain hydroxy alkyl groups having 1 to 8 carbon atoms, or hydroxy alkenyl groups straight and branched chain substituents having 2 to 8 carbon atoms; and R3 are independently selected from straight or branched chain alkyl groups having 1 to 8 carbon atoms, straight or branched chain alkenyl groups having 2 to 8 carbon atoms, substituted straight or branched chain hydroxy alkyl groups which they have 1 to 8 carbon atoms, or straight and branched chain substituted hydroxy alkenyl groups having 2 to 8 carbon atoms. These compounds are used to prepare pharmaceutical compositions and are useful for treating a variety of biological conditions. |