GSK945237 is the first molecule of a new chemical class that is being developed for treatment of respiratory tract and other infections such as skin and soft tissue. This study drug has been tested in animals but has never been given to humans. This is a two part study. The purpose of the first part is to study the side effects of this drug in humans, and to study how much of the drug gets absorbed in the blood stream The second part of this study will compare absorption of the study drug in the blood stream when given with food and when given under fasting conditions