An Adaptive Phase II/III, Two-Part, Double-Blind, Randomized, Placebo-controlled, Dose-Finding, Multi-center Study of the Safety and Efficacy of NaBen®, as an Add-on Therapy With Clozapine, for Residual Symptoms of Refractory Schizophrenia in Adults

This is a Phase II/III, double-blind, randomized, placebo-controlled, two-part, dose-finding,
Multi-center study, in which subjects with refractory schizophrenia will be enrolled.

This study will be conducted in two parts:

In Part 1 (i.e. dose finding portion) of the study One hundred seventy one (171) subjects
will be randomized in a 1:1:1 ratio (NaBen® 2000 mg/day: NaBen® 1000 mg/day: Placebo).

All subjects, after signing the Informed Consent Form (ICF), will be assessed during the
screening phase. This screening phase is designed to exclude subjects who have had more than
20 percent reduction in the PANSS total score using PANSS score evaluations at Visit 1 and
Visit 2. Only those subjects who successfully complete the screening phase and still meet the
study eligibility criteria will proceed with Randomization and the double-blind treatment.
All randomized subjects will receive eight (8) weeks of randomized treatment (NaBen® 2000
mg/day, NaBen® 1000 mg/day or Placebo). Study treatments will be given twice daily.

An Interim Analysis (IA) will be conducted when 171 subjects in Part 1 of the study have been
randomized and completed 8 weeks of treatment or early terminated, whichever occurs first.
Randomization of subjects in the study will continue until the IA of the Part 1 data is
completed. The data from the Part 1 analysis will be reviewed by an independent Data Safety
and Monitoring Committee (DSMC) who would assess the data for both safety and efficacy
trends. The DSMC responsibilities will be further elaborated in the DSMC charter. The DSMC
will approve continuation of the study and recommend the optimal dose and sample size
adjustment for the Part 2 of the study.

Assuming no sample size adjustment was made as a result of the IA, for Part 2 of the study a
total of 116 subjects will be randomized in a 1:1 ratio, of which 58 subjects will be
randomized to the NaBen® optimal dose group and 58 subjects to the Placebo group. The
procedures and assessments for subjects in Part 1 and Part 2 of this study will be identical
with the exception of the randomization schema.

Inclusion Criteria:

1. Male or female subjects who are between 18 and 55 years of age inclusive

2. Subject is capable of providing informed consent and is willing to sign the ICF prior
to study Screening and agrees to comply with the study protocol requirements, or the
subject has a Legally Authorized Representative (LAR) who can provide consent to be
enrolled into the study

3. If female and not infertile (defined below), the subject must agree for the duration
of the study to use one of the following forms of contraception 1) systemic hormonal
treatment 2) an Intrauterine device (IUD) which was implanted at least 2 months prior
to screening or 3) "double-barrier" contraception (condom, diaphragm and spermicide
are each considered a barrier). Females are considered to be infertile if they are
either a) surgically sterile or b) have had spontaneous amenorrhea for at least the
last 2 years and at least 2 years after the onset of amenorrhea while not receiving
hormone replacement therapy and had a Follicle-Stimulating Hormone (FSH) level greater
than 40 mIU/mL and an estradiol level less than 30 pg/mL

4. The subject has Physician confirmed DSM-V diagnosis of schizophrenia for the past 2
years based on subject's recorded history and confirmed by psychiatric evaluation and
MINI International Neuropsychiatric Interview For Schizophrenia and Psychotic
Disorders, version 7.0 (MINI, Version 7.0)

5. The subjects should have refractory schizophrenia as defined below (should meet at
least two: either a and b; or a and c; or a and b and c):

1. Prior non-response to at least 2 antipsychotic drugs of two different chemical
classes for at least 4-6 weeks each at doses ≥ 400 mg equivalents of
chlorpromazine or 4 mg/day risperidone, AND

2. No period of good functioning in previous 2 years; OR,

3. Moderate to severe psychopathology (total PANSS score equal or more than 70):
including persistent psychotic symptoms, recurrent mood symptoms, repeated
suicide attempts or suicidal ideation, uncontrolled aggressive behavior, moderate
to severe positive or negative symptoms or moderate-severe cognitive impairment

6. The subject has been receiving clozapine for a minimum of 6 months with the dose range
of 200-900 mg/day. The dose should have remained unchanged for at least 3 months prior
to Screening and not expected to change during the study

7. The subject is outpatient, and has been consistently symptomatic without significant
fluctuation per the Investigator, with no hospitalization for worsening of
schizophrenia within 3 months of the Screening. If the subject is hospitalized during
the study for worsening of schizophrenia symptoms the subject will be withdrawn from
the study

8. The subject has a minimum PANSS total score of 70 at the Screening and Baseline Visits
(Visits 1 and 2)

9. Without clinically significant abnormalities in physical exam, neurological exam and
laboratory assessments (urine/blood routine, biochemical tests and ECG) which would
exclude the subject from the study in the opinion of the Investigator. For ALT and
AST, clinically significant is defined as above two and a half times the upper limit
of normal

10. Body Mass Index (BMI) between 17 and 38 inclusive

11. Subject has a negative routine urine illicit drug screening test (including heroin,
amphetamines (including MDMA/ecstasy), cocaine, cannabis or PCP)

12. The subject has a caregiver or some other identified responsible person (e.g., family
member, social worker, caseworker, or nurse) as determined by the Investigator and per
the local regulations. The identified caregiver should be considered reliable by the
Investigator and per the local regulations in providing support to the subject to help
ensure compliance with study treatment, study visits and protocol procedures who
preferably is also able to provide input helpful for completing study rating scales

13. The subject must not be a danger to themselves or others per the Investigator's
judgment

Exclusion Criteria:

1. Meets the DSM-V criteria at Screening for intellectual disability, dissociative
disorder, bipolar disorder, major depressive disorder, schizoaffective disorder,
schizophreniform disorder, autistic disorder, primary substance-induced psychotic
disorder, dementia, or any other comorbid mental disorders that in the opinion of the
Investigator may interfere with study conduct and results interpretation

2. Initiation or dose change of lithium, antidepressant or other mood stabilizers within
16 weeks prior to Screening

3. Initiation or dose change of benzodiazepines or sleep medications, or any other
psychotropic medications due to worsening of schizophrenia symptoms or medication side
effects within four (4) weeks prior to Screening

4. The subject has previously received NaBen®

5. History of epilepsy, major head trauma, or any neurological illness other than
Tourette's syndrome which might impair the subject's cognition or psychiatric
functioning per the Investigator's judgment

6. History of allergic reaction to sodium benzoate

7. Serious medical illnesses such as end-stage renal disease, liver failure or heart
failure that, in the opinion of the Investigator, may interfere with the conduct of
the study

8. Any significant gastrointestinal disorders that, in the opinion of the Investigator,
markedly alter the absorption, metabolism or elimination of sodium benzoate

9. Any movement disorders with a total score higher than 6 on SAS scale, or more than 2
on any items of the AIMS scale

10. Current substance abuse, or history of meeting criteria for moderate or severe
substance abuse (including alcohol, but excluding nicotine and caffeine) in the past
six (6) months prior to Screening

11. Female subjects who are pregnant (as confirmed by serum pregnancy test performed at
Screening Visit) or are breast feeding

12. History of cancer not in remission for the last three (3) years except for basal cell
carcinoma and squamous cell carcinoma

13. Participation in a clinical trial within 3 months prior to Screening or more than two
clinical trials within 12 months

14. Electroconvulsive Therapy (ECT) within 6 months prior to Screening

15. The subject started a new non-medication treatment for schizophrenia or other
psychiatric condition within the last 3 months prior to Screening (e.g. individual
psychotherapy, cognitive behavioral therapy or rehabilitative therapy)

16. The subject's anti-EPS medications dose or regimen has changed within 2 weeks prior to
Screening

17. The subject's PANSS total score has decreased more than 20 percent using PANSS score
evaluations at Visit 1 and Visit 2