属于前体药物的开环核苷类抗病毒药物有（  ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24972' and id < 2127445 and id<>'2127445' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24972' and id > 2127445 and id<>'2127445' order by id asc limit 5