(2Z)-4-bromo-3-hydroxybut-2-enoic acid 2-butenoic acid, 4-bromo-3-hydroxy-, (2Z)- 4-Bromo-3-hydroxy-but-2-enoic acid Bromoacetyl acetic acid InChI=1/C4H5BrO3/c5-2-3(6)1-4(7)8/h1,6H,2H2,(H,7,8)/b3-1