61699-53-4
3-butoxycyclobut-3-ene-1,2-dione
→
~52%
65842-67-3
3-aminocyclobut-3-ene-1,2-dione
97962-64-6
3-Cyclobutene-1,2-dione, 3-amino-4-chloro-
~14%
31876-38-7
1-羟环丁-1-烯-3,4-二酮