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並前往https://books.google.com.tw/books?id=tUtXAAAAMAAJ&pg=RA1-PA72&lpg=RA1-PA72&dq=petroleum+ether&source=bl&ots=RUI0zvH00P&sig=ACfU3U3Je1sTzSWiAkVPipEErjq1p5FuFQ&hl=zh-TW&sa=X&ved=2ahUKEwi7lIOChbb0AhWOMZQKHf3tCeUQ6AF6BAgmEAM

U.S. Geological Survey Professional Paper - 第 72 頁 - Google 圖書結果

Fs . Extract with petroleum ether . R4 . Salts , 3.76 . F10 . Add 25 ml of acetic acid and filter . Sı . Residual solution . Extract with benzene . F6 .

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