STAVUDINE BP IMPURITY HStavudine EP Impurity H3V868S6FA7STAVUDINE IMPURITY H [EP IMPURITY]1-((2R,4R,5R)-4-HYDROXY-5-(ISOPROPOXYMETHYL)TETRAHYDROFURAN-2-YL)-5-METHYL-PYRIMIDINE-2,4-DIONE1-((2R,4R,5R)-4-hydroxy-5-(isopropoxymethyl)tetrahydrofuran-2-yl)-5-methylpyrimidine-2,4(1H,3H)-dione1-(2-DEOXY-5-O-(1-METHYLETHYL)-.BETA.-D-THREO-PENTOFURANOSYL)-5-METHYLPYRIMIDINE-2,4(1H,3H)-DIONE