多选题：番泻苷类的结构特点是（　　）

题目内容：
番泻苷类的结构特点是（　　） A．为二蒽醌类化合物
B．为双蒽酮类化合物
C．有2个COOH
D．有2个Glc
E．二蒽酮为中位连接，即10–10′位连接
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