Evaluation of the PK of NRL972 Following Pre- and co-Administration of Ursodeoxycholic Acid and Cloxacillin

Inclusion Criteria: 1. Males or females (females of non-childbearing potential or of childbearing potential while taking medically appropriate contraception) 2. Caucasian 3. Age: 21 - 40 years 4. BW 50 - 100 kg 5. BMI 20 - 26 kg.m-2 6. healthy based on the pre-study examination 7. willing and able to provide informed consent Exclusion Criteria: General - all subjects 1. Previous participation in the trial 2. Participant in any other trial during the last 90 days 3. Donation of blood during the last 60 days or a history of blood loss exceeding 300 mL within the last 3 months 4. History of any clinically relevant allergy (including hypersensitivity to the trial medications) 5. Presence of acute or chronic infection 6. Presence or history of any relevant co-morbidity 7. Resting systolic blood pressure \> 160 or \< 90 mmHg, diastolic blood pressure \> 95 or \< 50 mmHg 8. Clinically relevant ECG-abnormalities, prolonged QTc with \> 450 msec in males and \> 460 msec in females in particular 9. Presence of any relevant abnormality in the laboratory safety tests, especially low haemoglobin, increased liver enzymes 10. Positive serology for HBsAg, anti HBc and anti HCV 11. Positive HIV test 12. Positive alcohol or urine drug test on recruitment (and upon admission) 13. History of alcohol and/or drug abuse and/or daily use of \> 30 gr alcohol 14. Smoking more than 15 cigarettes/day or equivalent of other tobacco products 15. Use of prohibited medication 16. Suspicion or evidence that the subject is not trustworthy and reliable 17. Suspicion or evidence that the subject is not able to make a free consent or to understand the information in this regard General - all females 18. Positive pregnancy test 19. Lactating 20. Not using appropriate contraception in pre-menopausal women (note: under the conditions of the present study, women using hormonal contraceptives will be informed that this method is not sufficient during the study and that further i.e. mechanical methods \[condom, diaphragm with spermicidal gel\] should be us