Patent ID: 7160907

Claim:
A method of treating microbial infections comprising administering to a patient in need hereof a compound of formula (IA) or (IB): wherein: R 1 is optionally substituted C (1-6) alkyl or C (3-6) cycloalkyl or optionally substituted heterocyclyl; R 2 is vinyl or ethyl; R 3 is H, OH or F, and R 4 is H, or R 3 is H and R 4 is F, and R 5 and R 6 together form an oxo group; or R 3 and R 4 is each H, R 5 is OH or H and R 6 is H, or R 5 is H and R 6 is OH or H; or a pharmaceutically acceptable salt thereof; and wherein said microbial infection is caused by a Gram-positive bacteria, a Gram-negative bacteria, or a mycoplasma.