Table 2.

Details of clinical trial

	Arm	Intervention/Treatment
NCT04455243	Experimental: Intervention group	Drug N-acetylcysteine is given as 150 mg/kg q 12 h PO or IV every 12 h for 14 d diluted in 200 mL diluent (D5 % NS)
	Placebo comparator: Control group	Matching drug placebo is administered in the same schedule and volume as N-acetylcysteine
NCT04374461	Experimental: Arm A. (1) Transfer out of the critical care unit; (2) Extubation; (3) Toxicity; and (4) Death	Drug NAC. Others: Peripheral blood dosages are given in both groups as mentioned above
	Experimental: Arm B. (1) Discharge from the hospital; (2) Admission to a critical care unit; (3) Intubation; (4) Toxicity; and (5) Death	Drug NAC. Others: Peripheral blood dosage details as mentioned above
NCT04419025	Active Comparator: NAC Patients receiving N-acetylcysteine	Drug: N-acetylcysteine. In-patient: (1) Oral formulation 600 mg capsules of NAC q4 h until discharge; and (2) 1200 mg PO BID × 1-wk post-discharge Outpatient :2400 mg PO × 1 then 1200 mg PO BID × 2 wk
	No Intervention: Control patients not receiving N-acetylcysteine
NCT04458298	Experimental: Cohort A: OP-101 2 mg/kg. Participants will receive a single intravenous (IV) infusion of OP-101 2 milligram per kilogram (mg/kg) on Day 1	Drug: OP-101 will be administered as an IV infusion
	Experimental: Cohort B: OP-101 4 mg/kg. Participants will receive a single IV infusion of OP-101 4 mg/kg on Day 1	Drug: OP-101 will be administered as an IV infusion
	Experimental: Cohort C: OP-101 8 mg/kg Participants will receive a single IV infusion of OP-101 8 mg/kg on Day 1	Drug: OP-101 will be administered as an IV infusion
	Placebo Comparator: Cohort D: Placebo Participants will receive a single IV infusion of matching placebo on Day 1	Drug: Placebo. Matching placebo infusion will be administered intravenously

PO: Peros; NAC: N-acetylcysteine; NAC: N-acetylcysteine; BID: Bisindie; PO: Peros.