A Phase 3 Study With P2B001 in Subjects With Early Parkinson's

A total of 525 eligible subjects with early untreated Parkinson's disease (PD), will be
randomized to 4 treatment groups. Each subject will participate in the study for
approximately 18 weeks including a 30 day screening period, 12 week treatment period, and 2
weeks follow-up period.

Inclusion Criteria:

1. Subject has Parkinson's disease consistent with the UK Brain Bank Criteria and must
have bradykinesia with sequence effect. If rest tremor does not exist must have
prominent asymmetry of motor function.

2. Subject with disease duration less than 3 years since diagnosis.

3. Subject has a H&Y stage score of < 3.

4. Subject has a MMSE score ≥ 26.

Exclusion Criteria:

1. Subject has an atypical parkinsonian syndrome or secondary parkinsonism

2. Subject has previous exposure to levodopa or a dopamine agonist for longer than 4
weeks; if previous exposure was less than 4 weeks then it must not be within 2 months
prior to the baseline visit.

3. Subject has previous exposure to a MAO-B inhibitor for longer than 4 weeks; if
previous exposure was less than 4 weeks then it must not be within 3 months prior to
the baseline visit.

4. Subject who has taken anticholinergic drugs for PD or amantadine for longer than 4
weeks; if previous exposure was less than 4 weeks then it must not be within 1 month
prior to the baseline visit.

5. Subject has moderate (Child-Pugh categorization B, score 7-9) or severe (Child-Pugh
categorization C, score 10-15) hepatic impairment.