Phase 1 Study of BPN14770 in Participants With Hepatic Impairment and Healthy Controls

Key Inclusion Criteria: * Considered to be healthy (for healthy participants) or medically stable (for participants with hepatic impairment), as determined by medical evaluation. * Body weight ≥ 50 kilograms (kg) and body mass index (BMI) within the range ≥ 18.5 to \< 40.0 kilograms per square meter (kg/m\^2). * A diagnosis of clinically stable hepatic disease for at least 1 month prior to the screening visit, confirmed by medical history or previous confirmation of hepatic cirrhosis by liver biopsy or medical imaging technique. * Mild, moderate, and severe hepatic impairment based on the Child-Pugh classification score at the screening visit and Day ˗1 to determine eligibility: * Mild (Class A) hepatic impairment (Child-Pugh classification score 5 to 6) * Moderate (Class B) hepatic impairment (Child-Pugh classification score 7 to 9) * Severe (Class C) hepatic impairment (Child-Pugh classification score 10 to 15) * Healthy Participants matched to each participant with moderate hepatic impairment with respect to sex, age (± 10 years), and BMI (± 10%) Key Exclusion Criteria: * History or presence of/significant history of or current cardiovascular, respiratory, hepatic, gastrointestinal, endocrinological, hematological, or neurological disorders capable of significantly altering the absorption, metabolism, or elimination of drugs; constituting a risk when taking the study intervention; or interfering with the interpretation of data, in the judgment of the investigator…