A Single Dose Study of the Safety, Blood Levels and Biological Effects of Aes-103 Compared to Placebo in Subjects With Stable Sickle Cell Disease

Inclusion Criteria:

- Be male or female, aged 18-65 years old, inclusive

- Have sickle cell disease (SCD) (hemoglobin SS) without hospitalization for pain crises
in the 30 days before screening or for any SCD complications on more than two
occasions in the past 12 months; subjects are allowed concomitant usage of hydroxyurea
(HU) if the dosage is stable for the 2 months before screening and is at a dosage that
does not exceed the product's labeling.

- Have normal laboratory values as defined below:

- Direct bilirubin 0.1 to 1.0 mg/dL

- Alanine transaminase (serum glutamic pyruvic transaminase) 6 to 41 IU/L

- Creatinine for females 0.56 to 1.16 mg/dL and for males 0.77 to 1.19 mg/dL

- If female, be non-pregnant and non-breastfeeding and be surgically sterile or using an
acceptable method of contraception throughout the study and for 30 days after study
completion

- Have successfully completed an outpatient screening visit consisting of medical
history, physical examination, 12-lead ECG, vital signs, hematology and chemistry
tests, urinalysis, urine drug screen, pregnancy test (females), hemoglobin
electrophoresis, hepatitis B and C screening, and HIV serology (Note: Subjects with
abnormal screening values may be eligible if the results are not clinically
significant, as judged by the investigator or medical monitor)

- Be able to understand and have provided written informed consent including signature
on an informed consent form approved by an institutional review board

- Agree to abide by the study schedule and dietary restrictions and to return for the
required assessments

- Be willing to abstain from foods high in 5-HMF (e.g., coffee, malt, barley, balsamic
vinegar, dried fruits, and caramel products) for at least 3 days before each dosing

Exclusion Criteria:

- Have evidence of clinically significant cardiovascular, respiratory, renal, hepatic,
pulmonary, gastrointestinal, hematological, neurological, psychiatric, or other
disease that may interfere with the objectives of the study or the safety of the
subject, as judged by the investigator in agreement with the sponsor or medical
monitor, or have been hospitalized in the past 6 months as a result of these
conditions

- Have been hospitalized in the 14 days before enrollment, for any reason

- Be currently on regularly scheduled transfusions

- Have received a transfusion within 2 weeks of administration of study drug

- Have taken herbal preparations in the 2 weeks before dosing (Note: subjects are
allowed concomitant usage of HU and other scheduled prescription drugs if the dosage
is stable for the 2 months before screening and is at a dosage that does not exceed
the product's labeling. These scheduled prescription medications will be continued
during the study [including during dosing]. All other medications, including
over-the-counter medications used according to the product labeling, administered on
an as-needed basis will be permitted except for the 24 hour period before dosing and
the day of dosing. Medications for pain management will be allowed as needed
[including during dosing.])

- Have taken any other investigational drug within 30 days or 5 half-lives before the
screening visit, whichever is longer

- Consumed more than 14 alcoholic drinks per week or more than 3 drinks per day at any
point in the past month

- Have received disulfiram or 4-methylpyrazole within 30 days before dosing

- Have taken any cough-cold product containing dextrorphan or dextromethorphan within 4
days before dosing

- Have positive result for urine drug test (cocaine, marijuana, opiates, amphetamines,
methamphetamines, benzodiazepines, ethanol) at screening visit. However, use of
opiates, amphetamines, or benzodiazepines is allowed if prescribed by a physician.

- Have engaged in strenuous exercise within 72 hours prior to dosing

- Be considered not suitable for participation in this study for any reason, as judged
by the investigator

- Have pre-existing allergic or other adverse reactions to orange juice