['ischemic stroke']
['sp-8203 high dose', 'sp-8203 low dose', 'placebo']

        Inclusion Criteria:

          -  Stage 1-specific Criteria Patients with neurologic deficit of ≥4 points and ≤10 points
             by NIHSS score.

        Stage 2-specific Criteria Patients with neurologic deficit of ≥4 points by NIHSS score.

        Common Criteria for Stage 1 and Stage 2

          1. Adults aged ≥19 years and ≤80 years.

          2. Subjects fulfilling the criteria for rtPA therapy. ① Subjects who can receive rtPA
             therapy within 4.5 hours after the onset of early symptoms of acute ischemic stroke.

             ② Subjects requiring rtPA therapy according to the judgment of a neurologist.

          3. Subjects available for brain MRI (DWI, GRE/SWI [Susceptibility Weighted Imaging],
             FLAIR, MRA) scanning

          4. Subjects who consent to participate in this trial.

        Exclusion Criteria:

          1. Patients with systemic allergic diseases or hypersensitivity to specific drugs.

          2. Patients have condition as follows:

          1. Patients who were diagnosed with acute myocardial infarction (AMI) within the last 6
             months.

          2. Patients who had arrhythmia causing symptoms such as dyspnea or palpitation within the
             last 6 months.

          3. Patients showing the following abnormal ECG findings in stable condition at screening:

               -  The range of pulse rate - below 60/min or above 120/min

                    -  2nd or 3rd degree AV(Atrioventricular) block indicated in ECG

                         -  Congenital or acquired QT syndrome indicated in ECG

                            ④ Pre-excitation syndrome indicated in ECG

                            3) Patients with severe heart failure of NYHA(New York Heart
                            Association) Class III or Class IV.

        NYHA classification of heart failure defined as:

        Class I: patients with no limitation of activities; they suffer no symptoms from ordinary
        activities.

        Class II: patients with slight, mild limitation of activity; they are comfortable with rest
        or with mild exertion.

        Class III: patients with marked limitation of activity; they are comfortable only at rest.

        Class IV: patients who should be at complete rest, confined to bed or chair; any physical
        activity brings on.

        4) Patients with fever (≥ 38℃) or infection signs which require antibiotics at screening 5)
        Patients with pulmonary diseases (asthma, COPD[Chronic Obstructive Pulmonary Disease ], and
        active tuberculosis etc.) who have being recently been treated more than 1 month at
        screening, 6) Patients showing the following hematological findings: Patients with
        decreased hemoglobin (Hb< 10g/dL), decreased platelet count (PLT< 100,000/mm3) or
        hematocrit of <25% in complete blood count .

        7) Patients who have undergone hemodialysis and/or treatments due to nephropathies, acute
        or chronic renal failure at screening.

        8) Patients with a cancer in following conditions: diagnosed within 6 months before the
        screening time, or any treatment for cancer within the previous 6 months, or with
        recurrent/ metastatic cancer 9) Pregnant and breast-feeding women. However, women of
        childbearing age can participate in the trial only when non-pregnancy is confirmed. Woman
        of childbearing age is defined as woman who is not definitely menopause and did not receive
        a surgical contraception 10) Patients who do not consent to use double barrier
        contraception during the trial period.

        11) Patients who have participated in other clinical trials of other drugs within the past
        3 months. However, if they participated in observational studies and did not take drugs,
        they can participate in this trial.

        12) Patients who cannot participate in the trial according to the judgment of
        investigators.

        13) Patients with contraindication for the use of rtPA as shown in the below.
        [Contraindication for the Use of rtPA] A. Patients with hypersensitivity to gentamycin

        B. rtPA should not be administered when the risk of bleeding is high as follows:

        i. Patients who suffered from significant hemorrhagic diseases within the past 6 months or
        with known hemorrhagic diathesis.

        ii. Patients receiving oral anticoagulants such as warfarin sodium (INR>1.3). iii. Patients
        with apparent hemorrhage or recent serious or risky hemorrhage. iv. Patients with the past
        history of tumor, aneurysm, or central nervous system damage such as intracranial or
        intraspinal operation.

        v. Patients with hemorrhagic retinopathy, diabetes accompanied with visual disturbance or
        other ophthalmic hemorrhage.

        vi. Patients who underwent prolonged or traumatic cardiopulmonary resuscitation (>2
        minutes), obstetrical delivery or recently incompressible vascular puncture within the
        recent 10 days.

        vii. Patients with uncontrollable severe arterial hypertension. viii. Patients who have
        underwent major surgery for the recent 3 months or had recently significant trauma
        including all the trauma cases related with acute myocardial infarction or head trauma.

        ix. Patients with bacterial endocarditis and pericarditis. x. Patients with acute
        pancreatitis. xi. Patients confirmed to have records of ulcerative gastrointestinal
        diseases, esophageal varix, aneurysm or arteriovenous malformation for the recent 3 months.

        xii. Patients with severe liver diseases including hepatic failure, liver cirrhosis, portal
        hypertension (esophageal), or active hepatitis.

        C. Patients with mild neurologic deficit of <4 points on the NIHSS, or severe condition of
        >25 points on the NIHSS.

        D. Patients with seizure at onset of stroke. E. Patients with clinical presentation which
        suggests a subarachnoid hemorrhage, even if initial CT scan is normal.

        F. Patients who received heparin and have elevated active partial thromboplastin time
        (aPTT) within 48 hours before the onset of stroke.

        G. Patients who has history of stroke or had head injury within the recent 3 months.

        H. Patients with systolic blood pressure of >185mmHg or diastolic BP of >110mmHg, or who
        require aggressive treatment (intravenous administration) to reduce BP to the limits.

        I. Patients with blood glucose level of <50mg/dL or >400mg/dL.
      