题目内容
6-甲氧基-7-羟基香豆素的H-4信号是
2021-10-26
A.δ7.60(1H,J=9.5Hz)
B.δ6.85(1H,d,J=9.5Hz)
C.δ6.26(1H,J=9.5Hz)
D.δ3.95(1H,d,J=9.5Hz)
E.δ6.91(1H,d,J=9.5Hz)
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