A Study to Investigate the Mass Balance of BTD-001

Inclusion Criteria: * Healthy adult males aged 30-65 years old * BMI between18.0-35.0 kg/m2 unless investigator deems not clinically significant * Regular daily bowel movements * Provide written consent * Agrees to protocol specified contraception Exclusion Criteria: * Received any investigational treatment within last 3 months * Subjects who are study site employees, or immediate family members of a study site or sponsor employee * Subjects who have previously been enrolled in this study * History of any drug or alcohol abuse in the past 2 years * Regular alcohol consumption in males \>21 units per week * Current smokers and those who have smoked, including nicotine replacement or e-cigarates within the last 12 months. * Radiation exposure, including that from the present study, excluding background radiation but including diagnostic x-rays and other medical exposures, exceeding 5 mSv in the last 12 months or 10 mSv in the last 5 years. No occupationally exposed worker, as defined in the Ionising Radiation Regulations 1999, shall participate in the study * Subjects who do not have suitable veins for multiple venepunctures/cannulation as assessed by the investigator at screening * Clinically significant abnormal lab results * Positive drugs of abuse test result * Positive hepatitis B surface antigen (HBsAg), hepatitis C virus antibody (HCV Ab) or human immunodeficiency virus (HIV) results * Evidence of renal impairment at screening * History of or current seizure disorder or history of syncope, unexplained loss of consciousness or seizure in the past 3 years * Clinically significant medical/psychiatric history findings, or physical/neurological examination findings or significant history of or current suicidal ideation or behaviour * History of or current significant pulmonary, cardiac, renal, hepatic, chronic respiratory, gastrointestinal, neurological or psychiatric disease, substance dependence, porphyria, malignancy (with exception of local cutaneous squamous or basal cell carcinomas or local cervical squamous cell cancer resolved after resection) or hypothyroidism * Subjects with QT interval corrected for heart rate according to Fridericia's formula \>450 msec * Serious adverse reaction or serious hypersensitivity to any drug or the formulation excipients * Presence or history of clinically significant allergy requiring treatment, as judged by the investigator. Hayfever is allowed unless it is active * Donation or loss of greater than 400 mL of blood within the previous 3 months * Subjects who are taking, or have taken, any prescribed or over-the-counter drug (other than up to 4 g per day paracetamol) or herbal remedies * Failure to satisfy the investigator of fitness to participate for any other reason