3. Adult patients with chronic kidney disease for longer than 12 months and stable in the opinion of the investigator for the past 3 months 4. Systolic blood pressure <=160 mm Hg and >= 90 mm Hg on 2 readings. Diastolic blood pressure <= 100 mm Hg and >= 40 mm Hg on 2 readings during at least one of the screening visits.