19436-57-8 2H-Thiopyran-2-one, 3-(p-chlorobenzyl)-4-hydroxy-2-oxo-6-phenyl- 3-(p-Chlorobenzyl)-4-hydroxy-2-oxo-6-phenyl-2H-thiopyran-2-one 3-Chlorbenzyl-4-hydroxy-6-phenyl-thia-alpha-pyron [German]