Part 1 was a double-blind, randomized, placebo-controlled, non-confirmatory study in chronic bronchitis COPD patients. Part 1 consisted of up to 27-days of screening period, one baseline period of 1 day, 13 days of bid dosing with study treatment, morning only treatment on Day 14, follow up visits on Days 15 - 17, followed by a Study Completion evaluation. Twenty-seven patients were randomized in a 3:1 ratio to 3 cohorts..