Perhydro-beta-Carotene in the Green River Shale.
Several triterpenes and the tetraterpene perhydro-beta-carotene have been identified in the branched-cyclic hydrocarbon fraction of this Eocene shale. The analytical procedure included thiourea adduction followed by combined gas chromatography and mass spectrometry.
Murphy
S M
SM
McCormick
A
A
Eglinton
G
G