20076-86-2 2H-Thiopyran-5-carboxylic acid, 4-hydroxy-6-methyl-2-oxo-3-phenyl- 3-Phenyl-4-hydroxy-5-carboxy-6-methyl-thia-alpha-pyron [German] 4-Hydroxy-6-methyl-2-oxo-3-phenyl-2H-thiopyran-5-carboxylic acid SV 5