677716-50-6
methyl 5-methyl-3-ureidothiophene-2-carboxylate
→
~71%
35265-80-6
2,4-二羟基-6-甲基-噻吩并[3,2-d]嘧啶
57-13-6
尿素
+
76575-71-8
3-氨基-5-甲基噻吩-2-羧酸甲酯