A 32 year old lethargic male was brought to emergency depament with history of consumption of some drug .On investigation, he had low calcium, serum Creatinine -3.8 mg/dL, raised BUN . On ABG, metabolic acidosis was noted. On urine examination, calcium oxalate crystals were observed. He was treated with 4-methyl pyrazole. What could be the probable drug ingestion leading to following condition ?