A Phase I, Open-label Study of Absorption-Distribution-Metabolism-Excretion (ADME) of [14C]RIST4721 Following a Single Oral Dose to Healthy Male Subjects

Inclusion Criteria:

• Healthy males
• Must provide written informed consent
• Body mass index (BMI) 18.0 to 30.0 kg/m2 as measured at screening
• Weight ≥50 kg and ≤100 kg inclusive at screening
• Must have regular bowel movements (ie average stool production of ≥1 and ≤3 stools per day)

Exclusion Criteria:

• Subjects who have received any IMP in a clinical research study within the 90 days prior to Day 1
• Evidence of current SARS-CoV-2 infection
• 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 2017, shall participate in the study