412345-55-2
3-hydroxy-1,1-dioxo-1λ6-benzo[b]thiophene-2-carboxylic acid ethyl ester
→
33963-55-2
2-甲基磺酰苯甲酸
+
1209-81-0
2-(carboxymethylsulfonyl)benzoic acid
26759-41-1
methyl 2-(2-methoxy-2-oxoethyl)sulfonylbenzoate