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Identification of C31 and C32 Sterols in Pneumocystis carinii hominis‐Infected Human Lungs

SUMMARY Two sterols in autopsied whole lung specimens obtained from Pneumocystis carinii pneumonia patients were detected by gas‐liquid chromatography and their structures were elucidated by mass spectrometry and nuclear magnetic resonance spectrometry. Both were in the lanosterol series; the C31 sterol, with a methyl group at C‐24, was identified as euphorbol, and the more abundant C32 sterol, with an ethyl group at C‐24, is given the trivial name pnemocysterol.