23 Natural tetracycline 之分解產物具腎毒性而生Fanconi-like 症候群者：
(A) 4-epianhydrotetracycline
(B) 4-epitetracycline
(C) anhydrotetracycline
(D) isotetracycline

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統計： A(36), B(12), C(16), D(9), E(0) #443928