73926-95-1
diethyl 2-(diethoxymethyl)-3-formylbutanedioate
→
33527-26-3
thiophene-3,4-dicarbonyl chloride
53229-47-3
diethyl thiophene-3,4-dicarboxylate
18853-32-2
3,4-二氰基噻吩
4282-29-5
3,4-噻吩二甲酸