Cairnes D A, Mirvish S S, Wallcave L, Nagel D L, Smith J W
Cancer Lett. 1981 Oct;14(1):85-91. doi: 10.1016/0304-3835(81)90013-6.
The published method for isolating phorbol from croton oil has been improved and made more rapid, mainly by the addition of silica-gel column chromatography. The spectral characteristics are recorded, including the 13C nuclear magnetic resonance (NMR) spectrum.