117404-54-3 2-Amino-5-hydroxy-4-oxopentanoic acid 2-Amino-5-hydroxylevulinic acid 4439-84-3 5-Hydroxy-4-oxo-norvaline H-899 HON Levulinic acid, 2-amino-5-hydroxy- Norvaline, 5-hydroxy-4-oxo- Pentanoic acid, 2-amino-5-hydroxy-4-oxo- RI 331