-磷酸赤藓糖 色氨酸
→→ 莽草酸 →→ 分支酸 →→ 预苯酸 →→ 苯丙氨酸
磷酸烯醇式丙酮酸 酪氨酸
结构式是 CH2=C(OH)-CO-O-PO3H2.(-PO3H2)
是一个P接一个羰基和两个羟基
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