上游原料
Meldrum's acid; 2,2-dimethyl-1,3-dioxane-4,6-dione；Malonic acid cyclic isopropylidene ester3-Bromopropionic acid methyl ester; Methyl 3-bromopropionate3-[(triphenylmethyl)sulfanyl]propanoic acid5-{1-hydroxy-3-[(triphenylmethyl)sulfanyl]propylidene}-2,2-dimethyl-1,3-dioxane-4,6-dione2,2-dimethyl-5-{3-[(triphenylmethyl)sulfanyl]propyl}-1,3-dioxane-4,6-dionemethyl 3-(2,2-dimethyl-4,6-dioxo-5-{3-[(triphenylmethyl)sulfanyl]propyl}-1,3-dioxan-5-yl)propanoate6-[(triphenylmethyl)sulfanyl]-1,3,3-hexanetricarboxylic acid2-{3-[(triphenylmethyl)sulfanyl]propyl}pentanedioic acid
