Siler trilobum

C10H14O, Mr 150.22, oil. Monocyclic monoterpene aldehyde occurring in both enantiomeric forms (/ )-(- )- and(S)-(-)-P.,bp. 104°C(900 Pa), [o]d 150.7°. LD50 (rat p. 0.) 2500 mg/kg. (-)-P. constitutes ca. 50% of Perilla oil from Perilla arguta and P. frutescens var. crispa (Lamiaceae), (+)-P. constitutes ca. 60% of the Philippine Sulpicia oil from Sulpicia orsuami and also occurs in Siler trilobum, Siam latifolium. Citrus reticulata, and other plants. The ( )-oxime of (5)-(-)-P. is used in Japan as a sweetener Perilla sugar and has a 2000-fold higher sweetness than saccharose. 

Peiillaldehyde is derived from limonene. In fruits of Laserpitium siler and Laser trilobum, it may account together with limonene for more than 80% of the essential oil [16]. It occurs also in Perilla argata and Citrus retieulata [27]. 

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