20076-80-6 2H-Thiopyran-5-carboxylic acid, 4-hydroxy-6-methyl-2-oxo-3-phenyl-, ethyl ester 3-Phenyl-4-hydroxy-5-carbaethoxy-6-methyl-thia-alpha-pyron [German] 4-Hydroxy-6-methyl-2-oxo-3-phenyl-2H-thiopyran-5-carboxylic acid ethyl ester SV 4