Efficacy and safety of Neu2000, a multi-target drug designed to prevent both NMDA receptor-mediated excitotoxicity and free radical toxicity, will be investigated in acute ischemic stroke patients receiving endovascular treatment to remove clot within 12 hours following stroke onset. Neu2000KWL will be administered before endovascular treatment.

Neu2000 was designed as a multi-target neuroprotectant preventing both the NMDA receptor, a Ca2+ -permeable glutamate receptor, and free radicals, two major routes of brain cell death in stroke. Neu2000 is a moderate NR2B-selective NMDA receptor antagonist and spin trapping molecule (=free radical scavenger or antioxidant). Therapeutic potential of Neu2000 has been well demonstrated in four animal models of stroke with better efficacy and therapeutic time windows than either NMDA receptor antagonist or anti-oxidant advanced to clinical trials. In human phase I studies of 165 healthy subjects conducted in the United States and China, Neu2000KWL showed promising safety profiles without any serious adverse events up to a single intravenous infusion of 6000 mg that is far beyond the therapeutic target dose determined in animal models of transient ischemic stroke. Very recently, acute endovascular recanalization therapy has been introduced as the new standard care of care in acute ischemic stroke. The present study is aimed to examine efficacy and safety of Neu2000KWL in acute ischemic stroke patients receiving endovascular thrombectomy within 12 hours of stroke onset. This is a randomized trial, with placebo comparison, of comparing functional outcome at week 12 after 10 times of administration for five days.

Inclusion Criteria:

The trial subjects should satisfy all the following criteria.

1. Adults≥19 years
2. Patients who can start endovascular therapy within 12 hours after the symptomatic onset of Ischemic stroke.
3. NIHSS on screening time point ≥ 8 points
4. Patients whose general condition was favorable enough to perform daily activities without the help of others one day prior to the ischemic stroke onset (a person with mRS 0 or 1)
5. Patients whose CTA or MRA confirmed internal carotid artery occlusion and M1 or M2 occlusion of the middle cerebral artery, that are the types of major cerebral artery occlusion that can cause acute cerebral infarction and are subject to endovascular therapy.
6. Patients with early ASPECTS point≥4 (Noncontrast brain cross-section CT or Brain cross-section MRI diffusion weighted imaging)
7. Patients who spontaneously submitted a written informed consent to participation on this clinical study.

Exclusion Criteria:

A patient who meets any one of the conditions below cannot participate in the Clinical trial.

1. Patients who meet the following exclusion criteria on imaging of endovascular therapy

   ① Patients whose occlusion location that can cause an acute ischemic stroke in the CTA (CT angiography) image meets under the following conditions: A. Occlusion of bilateral large artery B. Simultaneous infiltration of anterior and posterior circulation

2. Patients who have contraindication to contrast media for brain imaging.

3. Patients who are receiving renal replacement therapy such as dialysis due to acute or terminal nephropathy at screening point.

4. Patients who were diagnosed with cancer or received cancer therapy within 6 months at screening or have recurrent or transitional cancer.

5. Patients have high body temperature of 38oC or more and need antibiotic therapy due to medical opinion of infectious disease at screening.

6. Patients who are having pharmacotherapy due to liver diseases such as hepatic cirrhosis, etc. at screening point.

7. Patients who are pregnant or lactating. However, only a woman who has no possibility of pregnancy can participate in this clinical research.

   Woman with child-bearing potential can be defined as the woman who has not had the clear menopause or who has not had surgical treatment that makes pregnancy impossible.

8. Patients who have participated in other clinical trial within past 6 months at the screening time as a base. However, in case of participation of observatory experiment, the patient can participate in this clinical trial.

9. Patients who are determined unsuitable for participation in this clinical trial due to other reasons