(B) The structure provided is the morphine skeleton. In morphine,the substituent at the $R$ position is a hydroxyl group $(-OH)$. In codeine,which is

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(B) The structure provided is the morphine skeleton. In morphine,the substituent at the $R$ position is a hydroxyl group $(-OH)$. In codeine,which is the methyl ether of morphine,the hydroxyl group at the $R$ position is replaced by a methoxy group $(-OCH_3)$. Therefore,for codeine,$R$ stands for $-OCH_3$.