important inclusion criteria: - subject is male of any ethnic origin. - subject is aged between 18 to 45 years, inclusive. - subject has a body mass index (bmi) of 18.5 to 32.0 kg/m2, inclusive. - subject is ≥50 kg. - negative reverse transcription polymerase chain reaction (rt-pcr) test for severe acute respiratory syndrome coronavirus-2 (sars-cov-2) at screening and negative lateral flow immunoassay test for sars-cov-2 at day -1. - healthy as determined by a responsible physician, based on medical evaluation including medical history, physical examinations, neurological examinations, concomitant medication, vital signs, 12-lead ecg and clinical laboratory evaluations. - male subjects must use a condom during the study and for 3 months after their final dose of study medication, if their partner is a woman of childbearing potential. in addition, their female partner of childbearing potential must use an additional method of highly effective contraception from first dosing until 3 months following final dosing. important

important inclusion criteria: - subject is male of any ethnic origin. - subject is aged between 18 to 45 years, inclusive. - subject has a body mass index (bmi) of 18.5 to 32.0 kg/m2, inclusive. - subject is ≥50 kg. - negative reverse transcription polymerase chain reaction (rt-pcr) test for severe acute respiratory syndrome coronavirus-2 (sars-cov-2) at screening and negative lateral flow immunoassay test for sars-cov-2 at day -1. - healthy as determined by a responsible physician, based on medical evaluation including medical history, physical examinations, neurological examinations, concomitant medication, vital signs, 12-lead ecg and clinical laboratory evaluations. - male subjects must use a condom during the study and for 3 months after their final dose of study medication, if their partner is a woman of childbearing potential. in addition, their female partner of childbearing potential must use an additional method of highly effective contraception from first dosing until 3 months following final dosing. important