This invention relates to FGFR3 inhibitor compounds, and specifically, provides compounds of the following formula for the treatment of systemic sclerosis,
fibrosis (e.g.,
pulmonary fibrosis), achondroplasia, lethal
dysplasia (e.g., type I), severe achondroplasia with developmental
delay and acanthosis nigricans (SADDAN), Muenke syndrome, or
cancer: