19436-56-7 2H-Thiopyran-5-carboxylic acid, 3-(p-chlorobenzyl)-4-hydroxy-2-oxo-6-phenyl- 3-(p-Chlorobenzyl)-4-hydroxy-2-oxo-6-phenyl-2H-thiopyran-5-carboxylic acid 3-Chlorbenzyl-4-hydroxy-5-karboxy-6-phenyl-thia-alpha-pyron [German]