NCIt definition : A steroid derivative characterized by the hydroxyl group in position C-3 of the steroid
skeleton, elimination of carbon 24.2 of the alkyl substituent, and unsaturated bonds
in position 5-6 of the B ring, and position 22-23 in the alkyl substituent. It is
synthesized by several unicellular algae and some terrestrial plants.;
Alternative definition : CRCH: Phytosterol with a double bond at the 22nd carbon and a methyl group at the
24th carbon.;