The absolute configuration at C-24 of chondrillasterol [(24R) -24-ethyl-5α-cholesta-7, (E) -22-dien-3β-ol] isolated previously from gourd seed oil (Cucurbitaceae) and its 24S-epimer, spinasterol, was confirmed by carbon-13 nuclear magnetic resonance spectroscopy. A significant chemical shift difference was observed in the C (21) and C (29) signals between the two epimers.
