3-(2,4-dichlorophenyl)-4-hydroxy-1-oxaspiro[4.5]dec-3-en-2-one; 3-(2,4-Dichlorophenyl)-4-hydroxy-1-oxaspiro[4.5]dec-3-en-2-one; 3-(2,4-Dichlorophenyl)-2-oxo-1-oxaspiro[4.5]dec-3-en-4-ol; 4-Hydroxy-3-(2,4-dichlorophenyl)-1-oxaspiro[4.5]dec-3-en-2-one; BAJ 2510