The invention relates to 4-{(1R)-2-[(6-{2-[(2,6-dichlorobenzyl)oxy]ethoxy}hexyl)amino]-1-hydroxyet- hyl}-2-(hydroxymethyl)phenol; and salts and solvates thereof, including those which are pharmaceutically acceptable, along with formulations thereof, combinations thereof, and methods for the treatment or prophylaxis of mammals by administering such compounds.