组成三萜类化合物基本碳架的异戊二烯单位数是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30715' and id < 2474751 and id<>'2474751' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30715' and id > 2474751 and id<>'2474751' order by id asc limit 5