Prior to this modification, the minor diastereomer could only be removed at the stage of the bis-TBS ether (-)- 21 .是什么意思_Prior to this modification, the minor diastereomer could only be removed at the stage of the bis-TBS ether (-)- 21 .在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句