Patent ID: 7057078

Claim:
A compound of formula (I) wherein X is a halogen atom, R is methyl or ethyl and, alternatively: a) R 1 is 3-methyl-2-buten-1-yl and oxo groups are present at the 1- and 10-positions; b) R 1 is 3-methyl-but-1-yl and oxo groups are present at the 1- and 10-positions; c) R 1 is 3-methyl-2-buten-1-yl and hydroxy groups are present at the 1- and 10-positions; d) R 1 is 3-methyl-but-1-yl and hydroxy groups are present at the 1- and 10-positions; and the pharmaceutically acceptable salts or esters thereof.