An Open-label, Single-center, Parallel-group Study to Assess Pharmacokinetics, Safety, and Tolerability of a Single Dose of MT-7117 in Subjects with Normal and Impaired Hepatic Function

Inclusion Criteria:

• Male and female subjects 18 to 75 years of age inclusive
• BMI 18 -35 kg/m2
• If female, you are nonpregnant, non-lactating and willing to utilize approved methods of birth control.

Exclusion Criteria:

• Subjects who have mild or moderate hepatic impairment according to Child-Pugh classification system at Screening (except normal healthy matches)
• Subjects who have a known clinically significant (CS) hypersensitivity to MT-7117 or related compounds, including melatonin.
• Subjects who have previously participated in a study involving MT-7117 or taken any other investigational drug within 30 days or 5 half-lives prior to the first dose of IMP, whichever is longer.
• Subjects who have a CS or unstable neurological, renal, cardiovascular, gastrointestinal, pulmonary, or hematologic disease for 14 days prior to enrollment.
• Subjects who have used any prescription or over-the-counter (OTC) medication within 14 days prior to first dose of IMP, except for occasional use of acetaminophen (< 1 g/day for normal hepatic subjects, and < 2 g/day for hepatically impaired subjects) or any other medication approved by the sponsor (a case-by-case basis). For hepatic impaired subjects, prescribed medication or OTC may be permitted by the Investigator and sponsor on a case-by-case basis.