3-fluoro-4-[(1R)-1-hydroxy-2-methylaminoethyl]benzene-1,2-diol 3-fluoro-4-[(1R)-1-hydroxy-2-methylamino-ethyl]benzene-1,2-diol 3-fluoro-4-[(1R)-1-hydroxy-2-methylamino-ethyl]pyrocatechol