Ascorbic acid Recruiting Phase 2 Trials for Clear Cell Renal Cell Carcinoma / Stage IV Renal Cell Cancer / Stage IV Renal Cell Cancer AJCC V7 / Unresectable Renal Cell Carcinoma / Stage III Renal Cell Cancer AJCC v8 / Metastatic Clear Cell Renal Cell Carcinoma / Metastatic Renal Cell Carcinoma Treatment