“…Besides the compounds described below (Table 11), other natural exogenous compounds, less common, have been labeled with carbon-11. Among these, [ 11 C]cinnamic acid 802 (oil of cinnamon), [ 11 C]1,3-diphenylurea 803,804 (a cytokinin found in coconut milk), [ 11 C]benzothiazole 153 (food additive), [ 11 C]benzaldehyde 805 (food additive), [ 11 C]octanal 805 (citrus oil), and [ 11 C]heptanoic acid 531 (additive in cigarettes). However, these compounds have been described only in one or two studies and not evaluated in vivo.…”