Truxinic acid

Truxinic acids are any of several stereoisomeric cyclic dicarboxylic acids with the formula ₂C₄H₄₂, found in various plants. They are obtained by a photochemical cycloaddition from cinnamic acid, where the two trans alkenes react head-to-head.

Isomers

Ten stereoisomers are possible.

Isomer	a	b	c	d	e	f
ω-truxinic acid	C₆H₅	H	COOH	H	COOH	H
β-truxinic acid	C₆H₅	H	H	COOH	H	COOH
neo-truxinic acid	C₆H₅	H	COOH	H	H	COOH
ζ-truxinic acid	H	C₆H₅	COOH	H	COOH	H
μ-truxinic acid	H	C₆H₅	H	COOH	COOH	H
δ-truxinic acid	H	C₆H₅	COOH	H	H	COOH